Rome's Don Luis Greisen-Porhyry Silver-Tungsten Property has a Great Address as Part of the "Great Cluster" of Laramide Porphyry
March 30 2011 - 2:46PM
Marketwired
Rome Resources Ltd. (TSX VENTURE: RMR) (FRANKFURT: 33R) is pleased
to announce results of uranium lead dating of zircons from
greisen-porphyry on the Don Luis Property, Sonora, Mexico. A Late
Cretaceous date of 67.7 +/- 0.6 million years (Ma, Fig. A1) was
obtained by Professor J.K. Mortenson using laser ablation - ICP-MS
methods at the Pacific Centre for Isotopic and Geochemical Research
at The University of British Columbia. Don Luis, about 45 km
north-northeast of Hermosillo the capital of Sonora, has the same
age as deposits in the "Great Cluster" (Fig. A1), and occurs at its
southern edge. The "Great Cluster" refers to the Laramide (75 to 50
Ma) group of porphyry copper-molybdenum deposits in Arizona,
western New Mexico and Sonora (Fig. A2) that are remarkable because
they define one of the richest copper provinces on Earth! This
confirms-based on deposit type, age and location-the great address
of Rome's Don Luis Property.
Recently revised geology of the Don Luis Silver-Tungsten (plus
molybdenum, tin and copper) Property is in Figure A3. Three large
greisen zones, each about 500 meters in diameter, mark an intense
alteration and mineralization trend that is about three kilometers
long east-west and a kilometer wide north-south. The Late
Cretaceous date of the mineralization and porphyry at the deposit
is here defined (Fig. A1). But another important feature is the
unconformity that marks a mid-Tertiary (35 to 30 Ma) erosion
surface or pediplane. This is of particular significance because
surface leaching of copper at this erosion surface could have
formed a copper-rich supergene-enrichment blanket at depth. This is
supported by: (i) supergene copper enrichment zones at many of the
porphyry deposits within the "Great Cluster" (e.g. Cananea and La
Caridad: Fig. A2), (ii) two 400 meter deep drill holes at Don Luis
that were wholly within oxide-limonite cap rock marked by
supergene, oxide silver concentrations, and (iii) moderate values
of copper (commonly about 100 ppm) in red, earthy-hematitic
limonite after sulfides at surface-features that often mark prior
chalcocite-copper enrichment. Abundant "brain rock" (UST-texture)
attests to its hydrous, end-stage magmatic origin. Lithophile
related tungsten, molybdenum and minor tin indicate a North
American Plate basement contribution to the magmatic system.
Rome Resources Ltd. is a Canadian mineral exploration company
focused on gold, silver, copper and tungsten projects in Argentina
and Mexico. It is publicly traded on the TSX Venture Exchange under
the symbol RMR, and on the Frankfurt Exchange as 33R. Company and
exploration details are available at: http://www.romeresources.com
(click: "What's New" (SEDAR News Releases) and "Projects").
On behalf of the Board of Directors
Colin I. Godwin, PhD, PEng, PGeo, President and Director of Rome
Resources Ltd.
Colin I. Godwin, PhD, PEng, PGeo, a qualified person under
National Instrument 43-101, has verified data disclosed in this
release. This News Release may contain forward-looking statements.
Forward-looking statements are statements which relate to future
events. These statements are only predictions and involve known and
unknown risks, uncertainties and other factors that may cause our
or our industry's actual results, levels of activity, performance
or achievements to be materially different from any future results,
levels of activity, performance or achievements expressed or
implied by these forward-looking statements. While these
forward-looking statements, and any assumptions upon which they are
based, are made in good faith and reflect our current judgment
regarding the direction of our industry, actual results will almost
always vary, sometimes materially, from any estimates, predictions,
projections, assumptions or other future performance suggested
herein.
APPENDIX A
Figure A1. The zircon radiometric date for the Don Luis greisen
is 67.7 + 0.6 Ma. This Late Cretaceous date (red) plots with those
of the Laramide magmatic belt (mainly 75 to 50 Ma) that
characterizes the "Great Cluster" of porphyry copper-molybdenum
deposits in Arizona, New Mexico and Sonora (Fig. A2).
Figure A2. The "Great Cluster" of porphyry copper deposits
(blue) occurs in Arizona, New Mexico and Sonora. The largest
deposit occurs less than 100 kilometers north of Don Luis at
Cananea (Mineral Park is geologically similar). Don Luis is within
of one the richest clusters of copper deposits in the world!
Figure A3. Geology of the Don Luis Silver-Tungsten (+
molybdenum, tin and copper) Griesen-Porphyry Property,
North-Central Sonora, Mexico. The greisen zones (yellow), each
about 500 meters in diameter, extend along a belt about three
kilometers east-west and one kilometer north-south. Abundant "brain
rock" (UST-texture) attests to its hydrous, end-stage magmatic
origin. Lithophile related tungsten, molybdenum and minor tin
indicate a North American Plate basement contribution to the
magmatic system.
To view Figures A1, A2 and A3 please visit:
www.romeresources.com.
CH Valoren No: 699 171
WKN: 886289
Neither the TSX Venture Exchange nor its regulation services
provider (as that term is defined in the policies of the TSX
Venture Exchange) accepts responsibility for the adequacy or
accuracy of this News Release.
Contacts: Rome Resources Ltd. Colin I. Godwin, PhD, PEng, PGeo
President and Director Professor Emeritus, The University of
British Columbia +(604) 939-6507 cigodwin@yahoo.com
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