Great Panther Silver Ltd. has completed the updated mineral resource estimates at the company's wholly owned Guanajuato mine complex in Guanajuato, Mexico. This update does not affect the San Ignacio Inferred resource estimate, which remains as reported in 2012.
- Updated Measured and Indicated ("M&I") mineral resources at the Guanajuato Mine Complex comprise 504,700 tonnes at a grade of 174g/t silver ("Ag") and 1.65g/t gold ("Au"), containing 4,430,000 silver equivalent ounces ("Ag eq oz"), using a 50g/t silver equivalent ("Ag eq") cut-off;
- Inferred mineral resources at the Guanajuato Mine Complex are estimated to comprise 434,000 tonnes at a grade of 140g/t Ag and 2.32g/t Au, containing 3,900,000 Ag eq oz. Different cut-off grades were used for the seven mineralized zones as indicated in the table below.
"We are pleased that ongoing underground drilling and development continues to extend the mineralized zones in advance of production," stated Robert Archer, President & CEO. "Although the M&I resource declined from previous levels, the Inferred resource increased substantially so we will be focusing our efforts on upgrading these ounces into the M&I category in 2014. The Inferred resource is based strictly upon drilling whereas the M&I resource also incorporates mine development and underground sampling. As such, the classification of a particular resource can often be a timing issue based upon mine development schedules. What is important for an underground operation like Guanajuato is that we are replacing ounces as they are being mined, as a 'rolling resource'."
Results of the recently completed development along the Veta Madre on the 525 metre level (lowest level) of the Cata Clavo included a 50 metre strike length grading 794g/t silver and 1.85g/t gold across an average true width of 3.6 metres. Underground drilling continues to explore the Veta Madre at Cata Clavo below the 525 level.
The 2013 Guanajuato Mine Complex mineral resource estimate contains Measured and Indicated mineral resources of 4,430,000 Ag eq oz including 3,348,000 Ag eq oz in the Measured category and 1,081,000 Ag eq oz in the Indicated category (see table below). Inferred mineral resources are estimated at 3,900,000 Ag eq oz. These are contained in the Cata Clavo, Los Pozos, Santa Margarita, San Cayetano, Promontorio, Valenciana and Guanajuatito zones. The Guanajuatito zone has been expanded with the addition of the Northwest and Southeast zones (see Company news release dated February 15, 2013), illustrating that additional mineralization is being found and added to inventory with systematic and focused drilling. A new zone, designated Los Pozos SE, has been added due to successful exploration immediately southeast of the Los Pozos zone. Additionally, initial Inferred mineral resource estimates have been added for the San Cayetano (Rayas shaft area south of Santa Margarita), Valenciana, and Promontorio zones.
Overall, from the last mineral resource estimate (effective date January 31, 2012), the Measured and Indicated classification decreased 21.6% (-1,219,000 Ag eq oz), while the Inferred mineral resource increased 55.8% (+1,397,000 Ag eq oz). Management is committed to maintaining or increasing mineral resources at the Guanajuato Mine, a commitment shown through focused drilling, and through better understanding of the complex structurally controlled mineralized zones.
Mining of four zones, namely Cata, Los Pozos, Santa Margarita and Guanajuatito, currently accounts for most of the Guanajuato metal production. This updated mineral resource will help in guiding development and with improving grades at the mines. Underground drilling will resume in 2014 with three drill rigs to delineate new resources on the upper extensions of Los Pozos SE (Veta Madre) and Santa Margarita, and the down dip extensions of the Cata Clavo zones.
Development and exploration are ongoing to expand mineral resources 1) along the Santa Margarita structure (hanging wall zone to Veta Madre) both to the southeast strike extension and between the 390 and 270 levels (above present mining), 2) at Guanajuatito (Veta Madre and a footwall zone) both laterally (50-120 level) and in deep extensions (245-390 levels), 3) at Valenciana (Veta Madre and both footwall and hanging wall zones as well as exploration both at depth and proximal to old workings), 4) at San Cayetano (Veta Madre), 5) at Cata in the upper areas along strike both to the SE and NW, and 6) at Promontorio (Veta Madre and both footwall and hanging wall zones).
Through a collaborate effort, a Special Projects team from the Company's Geology, Mining, and Planning Departments is reviewing all previously mined areas for opportunities in further exploitation. This has been a particularly successful effort as new opportunities can be turned into "un-official" mineral resources and mined within months due to existing access. Examples include the exploitation of high grade material from an old Los Pozos stope above the 250 level, along with expansion of the stope itself, and the further definition of mineralization presently being exploited on the Santa Margarita vein from the 390, 365, and 345 levels.
The updated mineral resource estimate for the Guanajuato Mine is valid as of July 31, 2013. Block model graphics, maps, sections and previous news releases can be viewed on the Company's website at www.greatpanther.com. The estimates were classified according to the CIM Definition Standards on Mineral Resources and Mineral Reserves and, as such, are consistent with the requirements of NI 43-101. The mineral resource estimate was completed by Linda Sprigg, RPGeo AIG, consultant mineral resource geologist for the Company and a Qualified Person ("Q.P."), and Robert Brown, P.Eng., and Company Q.P.
Both drill core and underground chip samples were assayed independently by SGS at the Company's Guanajuato Mine site laboratory. Aspects relating to mining and metallurgy are overseen by Juan Manuel Flores, V.P. Operations for Great Panther and its Mexican subsidiary, Minera Mexicana El Rosario, S.A. de C.V. Robert F. Brown, P.Eng., and Vice President of Exploration for the Company, is the Qualified Person for the Guanajuato Mine Project under the meaning of NI 43-101 and has reviewed these results. The Company's QA/QC program includes the regular insertion of blanks, duplicates, and standards into the sample shipments.