Guyana Frontier Mining Corp. is pleased to announce the results of recently received copper analyses from a diamond drilling program at the Sardine Hill Gold Project located in Guyana, South America. A total of 3,076 metres were drilled in 18 holes from December 2010 to April 2011. The gold results from the drilling program were previously reported on June 16, 2011.
The Sardine Hill drill holes intersected strongly weathered to fresh and unoxidized saprolite, and host bedrock, with characteristic chlorite-ankerite-sericite-tourmaline-epidote alteration. Widespread disseminated pyrite and lesser chalcopyrite, bornite-magnetite, and traces of arsenopyrite with gold occur within parallel and sub-parallel quartz veinlets along foliation planes. The style of gold-copper mineralization and alteration assemblages are similar to the Groete Creek and Toroparu projects in Guyana. In general, multi-element analyses from Sardine Hill indicate copper results are only moderately anomalous, with no obvious correlation between gold and copper values. For example, drill hole SH11-04 intersected 1.33 grams/tonne gold over 73.5 metres (estimated true width 61.01 metres) but averaged 0.06% copper over the same interval. Conversely, the best copper intersection in hole SH11-16 averaged 0.30% Cu with 0.56 grams/tonne gold over 94.5 metres (estimated true width 78.44 metres).
No significant values of other metals were detected in the follow-up multi-element analyses. Certain elements such as barium and molybdenum are elevated within higher grade gold intersections, and those elements may be useful as a geochemical guide to gold mineralization at Sardine Hill.
General Criteria for Calculation of Mineralized Intercepts
Sample and assay intervals are based on drilled intervals with controlled start and end depths. The estimate of grade across width is based on the multiple of reported gold and copper values and reported sample intervals. Core recoveries ranged from 100%, to less than 50% in short intervals, and all drilled intervals were treated equally in the weighted mean calculations. Sequences of samples with less than 0.15 grams of gold per tonne across more than three contiguous samples are not included in the stated intercepts.
All drill samples were shipped directly to the independent preparation facility of Activation Laboratories Ltd. (Activation) in Georgetown, Guyana (ActLabs Guyana) for sample preparation. All gold fire assay determinations were conducted in Activation's Venezuelan facility while multi-element analyses and copper assays were completed at its Ancaster, Ontario headquarters.
At ActLabs Guyana, all drill samples were crushed to 90% passing -10 mesh (1.7 mm), then split to provide a 250 gram subsample which is pulverized to 95% passing 150 mesh (105 microns). A 50 gram split was subject to Fire Assay Pre-concentration gravimetric analysis, with results reported in grams per tonne with a lower limit of 0.03 grams per tonne. A separate sub-sample, 0.25 grams of the pulp was subject to four-acid digestion and analysis by ICP/OES (Optical Emission Spectroscopy) to provide analyses for 35 elements.
The technical work disclosed in this document was planned and supervised by David Bending, M.Sc., P.Geo., who is a Qualified Person as defined in National Instrument 43-101, and is responsible for all technical information contained in this news release.
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To view a map of Sardine Hill visit Guyana Frontier's website at: http://www.guyanafrontier.com/s/SardineHill.asp.
About Sardine Hill
Sardine Hill consists of one Large Scale Prospecting Licence totaling 10,427 acres (4,219 hectares) located approximately 90 kilometres from the capital city of Georgetown. Guyana Frontier has the right to earn a 100% interest in Sardine Hill from a private Guyanese corporation, subject to a 3% net smelter returns royalty. Pursuant to an option agreement dated May 14, 2010 between Guyana Frontier and Mulgravian Ventures Corporation (Mulgravian), Mulgravian has an option to earn a 51% interest in Sardine Hill from Guyana Frontier. Guyana Frontier is the operator of Sardine Hill work programs.
About Guyana Frontier
Guyana Frontier is a public mineral exploration company listed on the TSX Venture Exchange (TSX-V: GYG), and is focused on the exploration, discovery and development of precious metals deposits located within Guyana, South America. Guyana Frontier began acquiring interests in Guyanese exploration properties in 2007, and now holds various rights to obtain working interests in approximately 342,000 acres (138,400 hectares) of prospective lands. Guyana Frontier's main asset is the Marudi Mountain Project, which was the subject of extensive historical exploration, but has not been the focus of a diamond drilling program since 2004. Guyana Frontier's goal is to develop a significant gold resource at the Marudi Mountain Project, and to explore its other Guyanese projects using funding from exploration partners.
For further information about Guyana Frontier, please contact Warren Stanyer, President and Chief Executive Officer at (604) 558-0077 .
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 release.