Orocobre Limited (TSX:ORL)(ASX:ORE) -
Highlights
-- An inferred resource has been estimated containing approximately 470,000
tonnes lithium carbonate equivalent and 1.6 million tonnes of potash.
Cauchari lies approximately 20km south of the proposed Olaroz processing
plant.
-- The maiden resource is based on five diamond holes in Orocobre's eastern
Cauchari properties and is only to an average depth of 170m in the
northern resource area and 50m in the southern resource area.
-- Lithium and potassium mineralization was encountered to the base of
drilling at 249m in hole CAU001D. An adjacent property owner, Lithium
Americas Corp, drilled to 450m depth and therefore future Orocobre
drilling is likely to substantially increase the maiden resource.
-- An exploration target of between 0.2 million and 2.6 million tonnes of
lithium carbonate equivalent and 0.5 million and 9.2 million tonnes of
potash has been estimated beneath the maiden resource based on a range
of porosity and grade possibilities to between 220m and 350m depth.
-- Whilst lower grade than Olaroz, the brine chemistry is similar to that
at Olaroz, with an attractive low Mg/Li ratio (2.8) and high K/Li ratio
(10). Initial evaluation of the process route suggests the brine could
be processed in an expanded Olaroz plant.
Orocobre Limited (the "Company" or "Orocobre") reports completion of the maiden
resource estimate at its 85% owned Cauchari Lithium-Potash properties
("Cauchari") in Jujuy Province, Argentina.
Murray Brooker, independent hydrogeologist, has estimated an inferred resource
in two adjoining areas of the salar, with a total 230 million cubic metres of
brine at average grades of 380 mg/L lithium and 3700 mg/L potassium. This is
equivalent to 470,000 tonnes of lithium carbonate and 1.6 million tonnes of
potash (potassium chloride) based on 5.32 tonnes of lithium carbonate being
equivalent to one tonne of lithium and 1.91 tonnes of potash being equivalent to
one tonne of potassium. Details are given in the table below.
To view Table 1, please visit the following link:
http://media3.marketwire.com/docs/orl1021tab1.pdf.
Due to differences in drill hole depths the resource has been divided into a
northern and a southern resource area. The resource has been estimated using a
conservative approach limited by the depth of drilling, with the estimate
extending to 170 m depth in the northern area of the properties and 50 m depth
in the southern area.
The resource boundaries are constrained by the company's property holdings,
drilling results and geophysical survey interpretation. No internal cut-off
boundaries have been used because both the Company and Competent
Person/Qualified person consider it is inappropriate to apply them in a fluid
resource where extraction will cause mixing. No external cut off was defined for
the resource, due to the limited drilling and pit sampling completed on the
project to date. The property boundaries were used as the western, northern and
southern boundaries to the brine resource. Hole CAU006R was excluded from the
resource due to a different drilling and sampling methodology and sub 100 mg/l
Li composite sample results.
The brine body has attractive chemistry, with a low magnesium to lithium ratio
(2.8) in the five diamond holes and a high potassium to lithium ratio (10). The
sulphate to lithium ratio averages 61 in diamond holes CAU001D-4D, rising to 114
in hole CAU005D in the eastern part of the resource area. Initial evaluation of
the brine chemistry suggests high recoveries of lithium could be expected using
a process route similar to that at the adjacent Olaroz project.
Introduction
The Cauchari Project is located immediately south of the Company's Olaroz
lithium-potassium project (Figure 1), within the Province of Jujuy, Argentina.
From October to December 2011 the company drilled five diamond and one rotary
vertical drill holes in the Cauchari properties, followed by chemical analyses
of the brine and porosity testing. This work provides the basis of the resource
estimate, by independent consulting hydrogeologist Murray Brooker, and other
conclusions presented in this announcement.
Orocobre activities have concentrated on exploration and development planning at
the Olaroz salar project since 2008. At Olaroz the company has completed a
definitive feasibility study and is planning to commence full-scale project
construction by the end of October. The Olaroz processing plant is planned to be
constructed in the south of the Olaroz properties, less than 20 km from the
company's Cauchari drill holes. Drilling and sampling activities at Cauchari,
commencing in late 2011, have confirmed the Cauchari salar has similar brine
chemistry to that at Olaroz.
Considering the similarities between the Cauchari and Olaroz projects, and their
close proximity, there are compelling synergies between the projects including
the expected use of shared infrastructure and processing plants, and it is
likely that any future development of the Cauchari brines would use the Olaroz
facilities. Consequently, from this point forward the company considers the
Cauchari project and its brine body part of the larger Olaroz project. In the
future, resources for Cauchari will be reported as a discrete part of the
overall Olaroz project resources.
To view Figure 1, please visit the following link:
http://media3.marketwire.com/docs/orl1021fig1.pdf.
Geology, Data and Interpretation
Orocobre initially carried out brine sampling from shallow pits across the
company's Cauchari properties in 2009. These pits showed elevated Li values in
brines within the salar, with lower concentrations on the margins of the salar.
The sample values may have been diluted, as some sampling occurring following
the wet season when fresh water floods into the salar basin.
The company also collected audiomagnetotelluric (AMT) and gravity geophysical
measurements on the Cauchari North line, and two others in the south of the
salar. The Cauchari North line (in the resource area) was interpreted to show
brine extending across the salar basin, to the base of the survey, providing an
attractive target for drilling. Overall, the salar basin was interpreted to be
at least 200 m deep. Drilling on adjacent properties within the Cauchari salar
by Lithium Americas Corp has shown the salar to be at least 450 m deep locally
(DDH7), with a number of holes drilled by that company to greater than 300 m
deep.
In late 2011, Orocobre drilled a total of six drill holes (five diamond and one
rotary mud) in the Cauchari salar to an average depth of 146 metres, with the
deepest hole CAU001D (in the north of the properties) drilled to 249 m. Holes
were drilled with an average spacing of 3.3 km. Drilling intersected from
surface a sequence of silt and clay up to 60 m thick, overlying a sequence of
halite, interbedded with intervals of clastic sediment to the base of drilling.
Down-hole geophysical logging data was collected to assist with correlation
between holes. All holes were geologically logged in detail by an experienced
geologist and photographs of the core taken.
Interpretation of diamond drilling data established two major lithological units
to the base of drilling, with six subunits internal to these. Unit A (from
surface) consists of silt and clay, with minor sand. The underlying Unit B is
predominantly halite, with interbedded intervals of silt and clay. Correlation
of units with the Olaroz salar to the north shows that Cauchari Unit A broadly
correlates to Units A through E at Olaroz, while Cauchari Unit B correlates to
Units F and G in Olaroz. Both Units A and B at Cauchari host the resource.
Halite (salt) reaches a maximum thickness of greater than 190 m in CAU001D in
the north of the salar, thicker than in the Olaroz salar to the north.
Sampling of brine from diamond drill holes established that lithium, potassium
and boron concentrations in brine are elevated, exceeding 400 mg/l Li in the
north and west of the resource areas (Holes CAU001D to 4D - Figure 2). Along the
eastern salar margins Li values are less than 200 mg/l, overlying intervals of
brine with greater than 400 mg/l Li in CAU005D. This suggests the principal
brine body, with higher Li concentrations, extends to the eastern boundaries of
the resource areas beneath lower grade brine. The brine body is interpreted to
be approximately flat lying.
This is similar to the situation on the west of the salar, where Lithium
Americas Corp. interpreted brine to continue beneath the Archibarca alluvial
fan. Geophysics carried out by Lithium Americas Corp. (NI43-101 report, July 12,
2012) suggests that brine continues beneath a near surface fresh water zone and
a mixed zone on both the western and eastern margins of the salar.
It is noted that this is a different situation from the spatially larger Olaroz
salar. The Olaroz resource is not capped by a layer of silt and clay, with
interbedded sands containing fresh water, but has relatively uniform and high
lithium grades extending to the surface salt crust.
Orocobre drilling and publicly released drilling results from Lithium Americas
Corp. (to the west of Orocobre's Cauchari properties) are presented as gridded
gm/l values in Figure 2. Reported mg/l drilling results have been converted to
gm/l results by multiplying the averaged g/l in-hole concentrations by the
thickness of the intercepts in metres in each hole. This presentation of
drilling results highlights the area of highest contained Li, but it is
important to note that low gm/l values also reflect the depth of drill holes and
shallow drilling in Orocobre holes CAU003D and 4D.
http://www.orocobre.com/Maps/Cauchari_Fig2_22October12.jpg
Diamond whole core samples were cut and sent to the British Geological Survey
("BGS"), with a total of 147 samples analysed for total porosity (Pt) and 118
for specific yield (Sy) in the UK. An additional 155 samples were analysed in
the company's Salta (Argentina) laboratory for total porosity. The Sy analyses
provided mean values for sands (4%, due to variable halite cementation), silt
mixes (5%), clays (2%), halite-sediment mixes (7%) and halite (2% for compact
halite to 16% for porous halite), with a thick sequence of halite interpreted to
underlie the resource area.
Resource Estimation
The 31.04 km2 areal extent of the Cauchari resource was controlled by the
location of the property boundaries, drilling results, geophysical profiles and
salar geomorphology. The resource estimate is based on geological controls from
the 6 holes drilled, with rotary drill hole CAU006R lying outside the resource
area. Brine composite samples were taken with a bailer at vertical spacing of
1.5, 3 and 6 metres during the diamond drilling. The location of the holes was
controlled by access to the salar, with embankments constructed to reach sites
and drill before the commencement of the wet season in early January. Drill
holes were located with a hand held GPS.
Mean Sy values from the BGS analyses were used to calculate a weighted Sy value
for each drill hole, based on the lithologies and thicknesses recorded during
logging. A continuous Sy value was also calculated for each hole, where
geophysical logging (neutron logs) was available. Continuous Sy values were
calculated using an algorithm relating neutron porosities (recorded every cm
down hole during geophysical logging) and Pt values; using a modification of the
methodology outlined by Houston and Gunn (2011). The results of the
lithology-weighted and the continuous Sy values were then averaged to obtain a
Sy value for each hole, as input to the resource estimate.
To view Figure 2, please visit the following link:
http://media3.marketwire.com/docs/orl1021fig2.pdf.
The averaged Sy data for each hole was used to calculate an equivalent brine
thickness at the location of each diamond hole over a m2 unit area (length of
interval in hole (i.e. 170 m) by Sy value = equivalent brine thickness for each
hole as m/m2).
The mass of lithium (Li), potassium (K) and boron (B) for the square metre
centred on each diamond hole was calculated by multiplying the equivalent brine
thickness (converted to a volume in litres) by the kg/l concentration of each
element of interest in the diamond hole. This mass data from the diamond holes
was then kriged across Orocobre's Cauchari tenements to produce concentration
maps of kg/m2 for Li (Figure 3), K and B. The sum of the individual grid cells
provides the total resource mass as presented in Table 1, on page 2 of this
press release.
The distribution of lithium as kg/m2 is shown in Figure 3
(http://www.orocobre.com/Maps/Cauchari_Fig3_22October12.jpg).
Further Drilling
The drilling program leading up to this resource estimate stopped with the onset
of the summer storms in the Argentine Puna region, at the beginning of January
2012. Drill holes CAU003D and CAU004D were terminated at 72 and 46 m
respectively, as a consequence of flooding within the salar and poor
trafficability for equipment.
Drilling results from CAU003D and CAU004D, together with results from other
holes in the program, suggest elevated lithium and potassium concentrations
continue beyond the depth at which these holes were abandoned. Consequently the
company believes further drilling would significantly expand the size of the
Cauchari resource.
An exploration target has been defined to show the potential additional lithium
and potassium contained beneath the resource defined in this announcement. The
information on which the exploration target is defined is outlined in the
following section.
Exploration Target
Based on available geophysics, geology and geochemistry it is possible to define
an exploration target beneath the resource outlined in Table 1 of this
announcement. The relationship of an exploration target to the CIM and JORC
resource definitions is shown in Figure 4.
It must be stressed that an exploration target is not a mineral resource. The
potential quantity and grade of the exploration target is conceptual in nature,
and there has been insufficient exploration to define a Mineral Resource in the
volume where the Exploration Target is outlined. It is uncertain if further
exploration drilling will result in the determination of a Mineral Resource in
this volume, however available information suggest this is likely.
To view Figure 3, please visit the following link:
http://media3.marketwire.com/docs/orl1021fig3.pdf.
The exploration target is where, based on the available geological evidence,
there is the possibility of defining a mineral resource. In keeping with Clause
18 of the JORC Code and CIM requirements the exploration target defined at
Cauchari is:
-- Not to be considered a resource or reserve,
-- Based on information summarized below.
It is a requirement of stating an exploration target that it is based on a range
of values, which represent the potential geological conditions. Values have been
selected to present an upper and a lower exploration target size. It is likely
that the lithium and potassium contained in the exploration target lies
somewhere between this Upper and Lower Case.
To view Figure 4, please visit the following link:
http://media3.marketwire.com/docs/orl1021fig4.pdf.
Information Used to Define the Exploration Target
Orocobre's drilling intersected grades of greater than 400 mg/l Li at or near
the base of holes CAU001D (249 m), CAU002D (186 m) and CAU005D (168 m).
Accordingly elevated Li grades are likely to continue beneath the depth of the
Cauchari northern and southern resource areas (170 m and 50 m respectively) and
beneath the depth of CAU001D.
Orocobre previously conducted a geophysical survey in the Cauchari Resource area
(Cauchari North line) in which gravity and Audiomagnetotelluric (AMT) data was
collected. The AMT data (Figure 5) suggests brine is present in salar sediments
beneath the Orocobre properties to depths of approx. 350 m or more. The gravity
survey interpretation for this line suggested depths of less than 200 m to the
salar basement. However, the occurrence of the thick halite sequence requires a
re-interpretation of this gravity data.
Additional information is available from the work undertaken by Lithium Americas
Corp. including drilling and geophysics. This information, which principally
relates to the area immediately west of the Orocobre resource, suggests salar
sediments were intersected to 449.5 m below surface (hole DDH007 in Appendix 1
of King, 2010), with multiple other holes intersecting salar sediments to 350 m
deep. Consequently there is reason to believe the lithium-bearing brine in the
Orocobre properties may extend to 350 m or deeper. The deeper drilling conducted
by Lithium Americas Corp (Figure 7-7, feasibility study July 11, 2012) suggests
there is a thick layer of sand underlying the halite sequence intersected in
Orocobre drilling. This deep sand unit suggests potential for the same unit in
the Orocobre properties, beneath the depth of current drilling.
To view Figure 5, please visit the following link:
http://media3.marketwire.com/docs/orl1021fig5.pdf.
Estimation of the Exploration Target
The following parameters have been used to estimate an Upper Assumption and
Lower Assumption case for lithium and potassium in the Cauchari Exploration
Target. The former uses the higher values for all parameters and the latter uses
the lower values. Values used are shown in Table 2.
The thickness of the resource (Table 1) depends on the drilling depths of
Orocobre holes and has been separated into a northern and southern area
reflecting this. The exploration target (defined to lie immediately below the
resource) is consequently also separated into a northern and southern target
under the same surface outlines.
Area
-- The Northern target covers 19.69 km2;
-- The southern target 11.35 km2; and
-- The total area (northern plus southern) in all cases is a total of 31.04
km2.
Thickness
-- In the northern area a thickness of 180 m (from 170 to 350 m depth) as
the Upper Assumption and the Lower Assumption; and
-- In the southern area a thickness of 300 m (from 50-350 m depth) as the
Upper Assumption and 170 m (from 50 to 220 m) as the Lower Assumption,
to account for the possibility of basement closer to surface or a
thinner brine column.
Porosity
Porosity is a vital measurement in determining a brine resource and it is
important to understand the difference between definitions of porosity. Only
part of the total porosity (Pt) consists of interconnected pores that can be
drained. The drainable porosity component is referred to as the specific yield
(Sy) - the proportion of water that can be yielded when the aquifer is pumped.
The BGS Sy measurements at Cauchari and Olaroz have been used for the porosity
values in the exploration target estimate.
-- For the Upper Assumption 13% is used as the specific yield (equivalent
to the sand dominant Sy at Olaroz or a mixture of porous halite (16% at
Cauchari) and some finer grained sediments)
-- For the Lower Assumption 2% is used as the specific yield (equivalent to
compact halite at Cauchari)
Lithium and Potassium Concentrations
-- A value of 537 mg/L for Li and 5350 mg/l K is used in the upside case,
(equivalent to the average of chemistry data sets from CAU001D bailer
and core extraction samples). This compares to values of 625 mg/l and
585 mg/l Li used for the updated Lithium Americas Corp resource (with a
500 and 354 mg/l Li cut off respectively). The corresponding K values
determined by Lithium Americas Corp were 5123 and 4851 mg/l,
-- A value of 260 mg/L Li and 2550 mg/L K is used in the Lower Assumption
case (representing the lower grade values from the southern shallow part
of the Orocobre Cauchari resource - see Table 1).
The contained lithium in the exploration target (combining values for the
northern and southern areas - see Table 2) ranges from the Upper Assumption case
of 2.6 mt of lithium carbonate and 9.2 mt of potash to the Lower Assumption case
of 0.2 mt of lithium carbonate and 0.5 mt of potash.
It must be stressed the exploration target is based on a series of assumptions
and future drilling is required to determine the brine grade and formation
porosity (Sy) values to establish whether a resource can be defined.
To view Table 2, please visit the following link:
http://media3.marketwire.com/docs/orl1021tab2.pdf.
Data Collection and QA/QC
Obtaining high quality samples in the field and ensuring that subsequent
analysis of the samples was carried out to a high standard was considered of
great importance, bearing in mind the technical challenges of sampling fluids
(brines) and semi-consolidated sediments.
Orocobre's initial diamond drilling program in the Cauchari salar was conducted
using lexan tubes in the place of the triple tube splits, to maximize core
recovery and geological understanding. Notwithstanding the best efforts of
geologists and contractors, core recoveries averaged 76%. Down-hole geophysical
logging was undertaken on diamond drill holes to provide additional geological
information. Fluorescein (biodegradable) dye was used in the drilling fluid, to
indicate whether brine samples taken with a bailer during the drilling were
contaminated with drilling fluid.
As a further check on the results of brine samples obtained by bailing, during
diamond drilling, brine was also extracted from core samples in a British
Geological Survey (BGS) laboratory in the UK, where this brine was also
analysed. Despite differences between the two chemical data sets the contained
metal and average grade of the estimated resource was similar for each data set.
Data obtained by bailing, (obtaining a brine sample from a steel tube with a
valve at the base, lowered into the drill hole on a cable) during drilling of
diamond holes, was used for the resource estimate and as the basis for
definition of the exploration target.
Core samples from diamond drill holes were used for measurements of total
porosity (total contained fluid) and specific yield (recoverable fluid), with
measurements made at the British Geological Survey laboratories using recognized
techniques.
Chemical analyses on bailed samples were undertaken by Alex Stewart Assayers
(Argentina) S.A. ("ASA") in Mendoza, Argentina. This laboratory has extensive
experience analyzing brines from salar projects. They are ISO 9001:2000
accredited and operate their own internal standards consistent with ISO 17025.
Standards and duplicate samples were used extensively, with laboratory-prepared
and field standard samples submitted to the laboratory comprising 16% of the
samples submitted and duplicates comprising a further 7% of the total samples.
With minor exceptions, analytical values of the standards fell within +/-10% of
the standard values for samples in the diamond drilling. Duplicate samples
showed a high level of sample repeatability (precision), with all but five
sample pairs falling well within +/-10% limits. Ion balances confirm the general
quality of the ASA analyses. Additionally, 15 duplicate samples were analysed at
the University of Antofagasta to compare with the ASA sample values. These
sample pairs show average reproducible percentage differences of 5.6% for
lithium and 16.6% for potassium. Overall the analyses are considered to be of
acceptable quality for the inferred resource estimate, based on the results of
the QA/QC samples.
The resource estimate summarized in this announcement has been prepared by
independent hydrogeologist Murray Brooker, addressing the standards set out in
the Canadian Securities Administrators' National Instrument 43-101.
Management Commentary
Orocobre's Managing Director & CEO, Richard Seville, stated: "We are encouraged
by the completion of the maiden Cauchari resource estimate of 470,000 tonnes LCE
(lithium carbonate equivalent) and 1.6 million tonnes of potash. This provides
us with an additional brine source, which would allow us to expand production at
our flagship Olaroz lithium project, which is in close proximity to Cauchari.
This resource is only shallow and there is clearly a much larger Exploration
Target beneath this resource.
"Cauchari, in general, is not as high grade as our Olaroz resource and sometimes
has the complexity of fresh water zones and mixed zones above the richer brines.
Nevertheless the brine body has attractive chemistry, with a low magnesium to
lithium ratio, and a high potassium to lithium ratio. These chemical
characteristics are expected to allow processing of Cauchari brine at the Olaroz
processing facilities. Conceptually, the Cauchari project could be developed
with relatively modest capital costs and expansion of the Olaroz plant. Now we
understand the potential of the Cauchari project we can determine how the
project will best contribute to the overall value of the company," Mr. Seville
said.
About Orocobre Limited
Orocobre Limited is listed on the Australian Securities Exchange and Toronto
Stock Exchange (TSX:ORL)(ASX:ORE), and is building a substantial
Argentinian-based industrial minerals company through the construction and
operation of its portfolio of lithium, potash and boron projects and facilities
in the Puna region of northern Argentina. The Company is building in partnership
with Toyota Tsusho Corporation the first large-scale, de-novo brine based
lithium project in 20 years at its flagship Salar de Olaroz resource, with
projected production of 17,500 tonnes per annum of low-cost battery grade
lithium carbonate scheduled to commence in Q2 2014. The Company also wholly-owns
Borax Argentina, an important regional borate producer. Orocobre has recently
been included in the S&P/ASX 300 Index. For further information, please visit
www.orocobre.com.
Competent Person's and Qualified Person's Statement
The technical information in this announcement has been prepared by Murray
Brooker of Hydrominex Geoscience. Murray Brooker is a geologist and
hydrogeologist and is a Member of the Australian Institute of Geoscientists.
Murray has sufficient relevant experience to qualify as a competent person as
defined in the 2004 edition of the Australasian Code for Reporting of
Exploration Results, Mineral Resources and Ore Reserves. He is also a "Qualified
Person" as defined by Canadian Securities Administrators' National Instrument
43-101. Murray Brooker consents to the inclusion in this announcement of this
information in the form and context in which it appears.
Additional information relating to the Company's Cauchari project is available
in the existing technical report entitled "Technical Report - Cauchari Project,
Argentina" dated April 30, 2010, which was prepared by John Houston.
Caution Regarding Forward-Looking Information
This report contains "forward-looking information" within the meaning of
applicable securities legislation. Forward-looking information contained in this
report may include, but is not limited to, the estimation and realization of
resources at the Cauchari project, the viability, recoverability and processing
of such resources, potential operating synergies between the Cauchari project
and the Olaroz project, and other matters related to the development of the
Cauchari project.
Such forward-looking information is subject to known and unknown risks,
uncertainties and other factors that may cause actual results to be materially
different from those expressed or implied by such forward-looking information,
including but not limited to the risk that further funding may be required, but
unavailable, for the ongoing development of the Company's projects; changes in
government regulations, policies or legislation; fluctuations or decreases in
commodity prices; the possibility that required permits may not be obtained;
uncertainty in the estimation or economic viability of mineral resources;
general risks associated with the feasibility and development of the Cauchari
project; unexpected capital or operating cost increases; the risk that a the
Olaroz project may not be completed; the risk that Orocobre will not be able to
negotiate a arrangements to treat Cauchari brines at Olaroz with the Olaroz
joint venture partner, Toyotas Tsusho Corporation; uncertainty of meeting
anticipated program milestones; as well as those factors disclosed in the
Company's Annual Information Form for the year ended June 30, 2011 filed at
www.sedar.com.
The Company believes that the assumptions and expectations reflected in such
forward-looking information are reasonable. Assumptions have been made
regarding, among other things: the Company's ability to carry on its exploration
and development activities, the timely receipt of required approvals, the prices
of lithium and potash, the ability of the Company to operate in a safe,
efficient and effective manner and the ability of the Company to obtain
financing as and when required and on reasonable terms. Readers are cautioned
that the foregoing list is not exhaustive of all factors and assumptions which
may have been used.
There can be no assurance that forward-looking information will prove to be
accurate, as actual results and future events could differ materially from those
anticipated in such information. Accordingly, readers should not place undue
reliance on forward-looking information. The Company does not undertake to
update any forward-looking information, except in accordance with applicable
securities laws.
ABN 31 112 589 910
FOR FURTHER INFORMATION PLEASE CONTACT:
Australia and Asia: Orocobre Limited
Richard Seville
Managing Director
+61 419 916 338
rseville@orocobre.com
North America: Orocobre Limited
Bruce Rose
VP, Corporate Development
+1 604 377 1423
brose@orocobre.com
www.orocobre.com
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