Dorex Minerals Inc. identifies and expands a new mineralization model for the Tres Hermanos Mine project
Vancouver, BC. April 18, 2012 – Dorex Minerals Inc., TSX-V. “DOX” (The "Company" or “Dorex”) announces that it has received the results from its successfully completed Phase I field exploration and geochemical rock-sampling program on the Tres Hermanos Mine Property. The purpose of the Phase I exploration program was to generally orient the Company with the Project, to identify the primary mineralization model and to generate future exploration targets, including drill testing.
Historically documented gold assays from the mine workings are limited; however, the reported yield from the upper workings was 47.9 grams per tonne gold and the lower workings 16.5 g/t gold. Documented assays from levels two to six of the eight levels in 1980 returned from 0.9 g/t gold to 190 g/t gold (6.1 ounces gold) including an assay of 29.2 g/t from level 6. Gold-copper assays from surface samples of the mineralized system on the property collected by Dorex personnel returned elevated gold values from trace up to 5.75 g/t and from trace to 0.74 per cent copper. From the initial discovery of gold on the property in 1903, an undocumented report of 22,500 ounces of gold was extracted from 1914 to 1916, which was followed by processing of the ores in the mill of 30-tons-per-day capacity and the recovery of documented 275 kilograms of gold. Old Mine operations of the Tres Hermanos Property encompass a mineralized structure shoot of approximately 220m deep by 140m wide.
The 2012 Dorex program resulted in the collection and analysis of 438 samples (including QA/QC samples). In general the sampling program was divided into two targets, systematic surface chip sampling of 1 meter chip samples wherever exposure was encountered, and the sampling of the currently accessible underground workings on 1 metre chip sample intervals. Results from the program include assays from trace up to 8.15 g/t Au, from trace up to 436 g/t Ag, and from trace up to 12% Cu; all from 1 metre surface chip samples.
The project is now interpreted to consist of five related mineralized zones, the Southern Extension, the East Zone, the Connector Zone, the Dominadora Zone and the Main Zone, together representing an approximately 2 kilometre long mineralized corridor, with each of these zones offset from each other by cross-cutting, post-mineralization faults. On average, this corridor is 30-50 metres wide over a greater than 2 kilometre strike length, with only the Main Zone having seen any advanced exploration (mining) to date. The Southern Extension Zone represents an interpreted anomalously mineralized structural trend at least 30m wide and extending south from the Property boundary by at least 400m. This zone returned assays from trace up to 1.7g/t Au and from trace up to 6.5% Cu. The anomalous trend highlights the structurally controlled gold and copper mineralization extending south from the Property.
The Connector zone consists of two distinct mineralized anomalies, the East and West Connector Zones, and is interpreted as a newly defined structural zone offset from the Main and South Extension Zones. The East Connector Zone is defined by a strongly leached mineralized structure approximately 42 metres wide, assaying from trace up to 0.44% Cu, from trace up to 11 g/t Ag, and from trace up to 372ppb Au. The West Connector Zone was mapped as a 30 metres wide strongly leached mineralized area, reporting from trace up to 1g/t Au, 55g/t Ag and 0.39% Cu. This zone also returned the highest base metal (Pb, Zn) of all the zones, suggesting a potential for vertical zonation within the mineralized system. The highest silver results reported from the Phase I program (543ppm Ag) were also sampled from within this zone and were associated with extensive scorodite mineralization on fractures and related water seeps.
The Main Zone is punctuated by the location of the Tres Hermanos Mine, which was entered and sampled during the course of the program. Full mine access is precluded by ground conditions and mine flooding, and currently only the main access level is accessible. During underground (and spoil pile) mapping and sampling, neither epithermal veins nor vein material were encountered; rather, a mineralized, hydrothermally altered breccia with visible copper oxide mineralization (malachite and azurite) was the apparent target of historic mining operations. The underground sampling returned assays from trace to 2.4 g/t Au over 1 meter chips and from trace to 1.7% Cu.
The Main Zone surface sampling returned assay values from trace up to 8.15g/t Au, from trace up to 55g/t Ag, and from trace up to 12% Cu over 1 metre chip samples. Within this zone, mineralization has been demonstrated to continue across at least 40 metres true width in equivalent brecciated units as found in the Main Zone underground workings.
Within the Dominadora Zone, surface sampling of 1 metre chip samples returned values from trace to 2.3 g/t Au, from trace to 14.8 Ag, and from trace to 0.14% Cu. Mineralization is equivalent to that found in Main Zone, further highlighting the evidence for the continuity of gold-copper mineralization within the structural corridor.
The program was successful in identification of anomalous gold-copper mineralization within the expected ranges associated with a mineralized system of this style. Further, Dorex has identified a new mineralization model for the THM project.
President Julius Galik commented, “Dorex is excited with the positive Phase I THM results. With the confirmation of gold-copper mineralization on the THM property, and a re-evaluation of the mineralization model management has turned its head towards reviewing the data compilation and assessing the Project’s potential to host structurally related gold mineralization over consistent widths and lengths .”
A map highlighting the areas sampled and results obtained from the program will be made available on Dorex’s website.
A total of 438 samples were delivered by Dorex personnel to Inspectorate Laboratory preparation facility in Durango, Mexico where samples were sorted and crushed to appropriate particle size (pulp) and representatively split to a smaller size for shipment to Inspectorate’s Vancouver analysis facility. There, the samples were assayed using their GENX30 analysius package, which is a 30 element ICP, cold vapour Hg and Fire Assay Au with automatic overlimits for Au, Ag, Cu. A comprehensive system of standards, blanks and field duplicates was implemented in the 2012 exploration program and has been analyzed by the Project QP with no irregularities noted.
Paul D. Gray, PGeo, is the company's qualified person with respect to the company's THM gold project and has reviewed and approved this press release.
Website www.dorexinc.com
About Dorex Minerals
Dorex Minerals Inc. is a base and precious metals exploration and development Company listed on the TSX Venture, Frankfurt Exchange under the symbol "DOX" and code "A9L". The Company is focused on discovering and advancing mineral properties by utilizing modern geological science. Managed by a team of experienced professionals, the Company's corporate philosophy is to build shareholder wealth through the acquisition and development of high quality exploration projects. Dorex's portfolio is currently focused in Mexico and the Slovak Republic.
Further information about Dorex can be obtained from the website www.dorexinc.com, e-mail dorexinc@gmail.com or by phoning 604-688-1160.
ON BEHALF OF THE BOARD OF DIRECTORS,
“Julius Galik”
Julius Galik
President & CEO
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