Vancouver, BC (PRWEB) September 6, 2007
Amera Resources Corporation (AMS-TSX.V) is pleased to announce that the Cocha copper-silver property has been expanded and now covers a total of 7,060 hectares. Surface exploration and sampling work carried out over the entire property over the past several months has resulted in the identification of three new zones of high-grade mineralization (see Map 1), and a number of additional showings. To date, a total of 482 rock and 926 soil samples have been taken on the property.
Two of the zones (North Cocha and South Cocha) host copper-silver mineralization, similar to the Discovery Outcrop Trend, while the East Cocha Zone is characterized by gold-silver-copper mineralization (see Table 1). Highlights include:
- 2.65% copper and 8.9 g/t silver over 0.5m
- 0.80% copper and 8.9 g/t silver over 10.0m
- 2.80% copper and 105 g/t silver over 0.40m
- 6.97 g/t gold, 53.4 g/t silver and 3.1% copper over 0.7m
These three new mineralized zones and additional showings add significantly to the potential of the Cocha project where drilling along the Discovery Outcrop Trend at the Central Cocha Target in 2006 intersected 30.23m grading 2.67% copper and 24.1 g/t silver in diamond drill hole COCHA-06-03. A Phase II drill program which will follow up on last years drilling along the Discovery Outcrop Trend and provide a first test of the South Cocha target is planned to commence in mid-September. Surface work to advance the other targets on the property to the drill stage is proceeding in tandem with drill pad permitting.
The style of mineralization discovered on the Cocha property is interpreted by Amera as sediment-hosted copper-silver type, comparable to the giant Lubin Deposit (115 billion pounds of copper, 2.3 billion ounces of silver1) in the Kupferschiefer district of Poland and the White Pine Deposit (18.3 billion pounds of copper and 800 million ounces of silver1) in the Upper Peninsula of Michigan.
The North Cocha copper-silver target is located 1.8km northwest of the Central Cocha Target. A number of historical surface workings occur in areas of stratabound copper-silver mineralization and occur over a strike length of 800m mainly within five oxidized domains which vary between 90 and 200m in strike with widths between 15 and 20m.
To date a total of 95 rock chip samples have been collected in the area over sample widths ranging from 0.3 to 6.3m. Rock sample results for copper range from 3 ppm to 26,500 ppm (2.65%), for a 0.5m chip sample, and average 908 ppm; silver ranges from 0.1 ppm to 8.9 g/t, for a 0.5m chip and averages 1.0 g/t (see Table 1). 550m to the southeast a probable extension to the zone was identified and a total of 18 rock samples were collected over widths of 0.4 to 4.0m. In this area rock chip results for copper range from 8 to 15,300 ppm (1.53%) and average 5305 ppm; silver results range from 0.1 to 16.0 g/t and average 3.7 g/t.
The area is underlain by a sequence of grey to dark grey, finely-bedded limestone of the Upper Ordovician Tarma Group, in fault contact with red sandstone and purple volcaniclastic rocks of the Upper Permian Mitu Group. In the mineralized area the limestone has been recrystallized and contains calcite veinlets with disseminated chalcopyrite. Bedding in the area strikes 295° and dips 75° northeast. Two orientations of faulting occur; one related to the mineralization at 295° dipping 75-80° northeast, and a second at 30°-40° dipping 80° southeast that cuts the other orientation. Mineralization appears to be concentrated at the interceptions of these faults.
The main area has been mapped at a scale of 1:2,500. Further surface work including soil sampling is required to identify drill targets.
The South Cocha copper-silver target is located 3.5km south of Central Cocha. The area also has a number of small underground workings believed to date back to the 1960s. It is underlain by carbonaceous red sandstones and purple volcaniclastic rocks of the Permian Mitu Group overlain by the Pucara limestones. Two styles of mineralization are observed: 1) replacement of a Pucara limestone bed near the Mitu contact and 2) mineralization associated with irregular tectonic breccias. Mineralization comprises chalcopyrite, bornite, malachite azurite associated with calcite, pyrite and quartz. The Southern Cocha Zone is traceable for over 900m of strike and varies from 3 to 20m in width with anomalous mineralization over up to 150m width. A probable extension to the South Cocha zone is located along strike 850m to the northwest of the main zone.
Three sets of faults in the area have locally brecciated the limestones; 1) a pre-mineralization northwest-southeast trending set, 2) an east-west set and 3) a northeast-southwest one. The northwest-southeast trending mineralized structure extends for approximately 1km with mineralization most concentrated where it intercepts the other two fault orientations. Fresh porphyritic dacite-andesite outcrop along the northwest-southeast fault zone.
Work to date has included geological mapping, prospecting and surface geochemistry. Rock chip samples were collected along lines spaced at approximately 300m. A total of 162 rock chip samples, ranging in width from 0.1 to 20m, were collected with the objective of delineating the mineralized structure. Rock sample results for copper range from 2 ppm to 25,300 ppm (2.53%), for a 0.1m chip sample, and average 2,221 ppm; silver ranges from 0.1 g/t to 343 g/t, for a 0.3m chip, and averages 15.3 g/t; lead ranges from 2 ppm to 172,000 ppm (17.2%), for a 0.5m chip sample, and averages 2441 ppm; and zinc ranges from 7 ppm to 5570 ppm, for a 1m chip sample, and averages 523 ppm (see Table 1). 850m northeast of the main South Cocha zone a probable extension was sampled with assays returning up to 3.53% Cu and 127 g/t silver from a grab sample and 2.8% copper and 105 g/t silver from a 0.4m chip sample.
Several diamond drill holes are planned to test the Southern Cocha target as part of the upcoming Phase II drill program.
The East Cocha gold-silver-copper target is located 4.5km southeast of Central Cocha. Numerous old workings exist in the area, some of which are also believed to date back to the 1960s. The area is underlain by red sandstones and volcaniclastic rocks of the Mitu Group. No intrusive rocks have been noted in the area to date.
Mineralization comprising chalcocite, chalcopyrite, bornite, covellite, malachite associated with barite, calcite and quartz is hosted by an ash tuff bed. The mineralized zone trends 345° and dips at 75°-80° northeast with mineralization being observed over 1km of strike extent with widths ranging from 0.3 to 3m.
To date a total of 13 rock samples have been collected ranging from grab samples to 10m chip samples. Gold values range from 0.05 ppm to 6.7 g/t, over 0.7m, and average 0.93 g/t (see Table 1). Silver values range from 0.5 to 185 g/t, over 0.45m, and average 42.5 g/t. Copper values range from 41 ppm to 60,100 ppm (6.01%), over 1m, and average 17,495 ppm (1.75%). The area is being mapped at 1:25,000 scale and a program of additional rock and soil sampling is underway to further delineate the mineralization and locate drill targets.
ALS Chemex Laboratories, an internationally recognized assay service provider, in Lima, Peru and North Vancouver, Canada, performed analyses for the samples reported herein. The technical information contained in this release has been reviewed by Dr. David A. Terry, P.Geo., Vice President Exploration for Amera, a Qualified Person as defined in National Instrument 43-101.
Amera Resources Corporation is a metals exploration company focused on the Americas. The Company has three drill-ready projects in Peru; is advancing others to the drill stage; and, is fully funded to carry-out its exploration programs. Amera is constantly evaluating new opportunities through management's network of contacts in the resource sector. The Company is committed to growth and adding shareholder value through precious and base metal discoveries.
Visit http://www.ameraresources.com/s/NewsReleases.asp for detailed charts and diagrams
ON BEHALF OF THE BOARD
Mr. Nikolaos Cacos, President & CEO
1 Sediment-Hosted Copper Deposits of the world: Deposit Models and Database By Dennis P. Cox, David A. Lindsey, Donald A. Singer and Michael F. Diggles; USGS Open-File Report 03-107 Version 1.0