NR: Mining at Lluvia de Oro Yields Higher Gold Grades and more Gold Ounces
posted on
Nov 04, 2010 01:22PM
NWM Mining Corporation is a Canadian mineral exploration company focused on the development of the Lluvia de Oro / La Jojoba gold mine located in Sonora in North West Mexico
NWM Mining Corporation (the “Company” TSX-V: NWM) is pleased to announce results received from the use of Selective Mining at the Lluvia de Oro mine. Selective Mining focuses on the elimination of waste by utilizing closely spaced blast hole drilling with smaller, more flexible mining equipment.
Sampling of heaps revealed that unnecessary dilution of ore occurred during mining at Lluvia de Oro in the period from 1995-98. With the commencement of mining in August, 2010, closely spaced blast hole patterns have been used in both ore and waste zones. The assay results from this close spaced drilling have not only identified internal waste which can be discarded, but have also outlined small stringers of ore grade material which were not detected by the wider spaced drilling used for reserve definition and for calculation of the NI 43-101 compliant reserve report. With the ability to selectively mine zones as small as 11.25 cubic meters, the material that is now moved to the leach pads will include significantly less waste material (less dilution).
“Selective Mining results in higher gold grades being delivered to the heap. Due to the detection of stringer gold zones in material previously considered waste, Selective Mining has also resulted in more gold ounces defined by blast holes than indicated in the ore reserve block model. Results from the first seven bench blasts are shown in the table below.
Blast-hole samples are collected at the drill site while the drilling is being conducted. The drilled material is riffle-split at the site with half of the sample submitted to Laboratorio Tecnologico De Metalurgia LTM SA DE CV in Hermosillo, Sonora, for preparation and analysis by fire assay. Upon receipt of the analyses, the data is entered into Mintec Inc.’s Mine Sight software program which calculates the block grades.
Laboratory gold standards, blanks and 10% duplicate samples are analyzed concurrently with blast hole drill samples to ensure acceptable quality control and quality assurance.
Mr. Rodney A. Blakestad, C.P.G. is a designated Qualified Person pursuant to National Instrument 43-101 of the Canadian Securities Administrators for this press release and has reviewed and approved the technical and scientific disclosure contained herein.