Lincoln Confirms Gold/Silver Structures in Northwest Area of La Bufa, Chihuahua, Mexico
VANCOUVER, BRITISH COLUMBIA--(Marketwire - Sept. 20, 2011) - Lincoln Mining Corporation (TSX VENTURE:LMG) ("Lincoln" or the "Company") is pleased to announce that recent core drilling has established the existence of gold/silver mineralization in several strong quartz-breccia structures and stockwork zones that extend for hundreds of meters at its 100% owned La Bufa project in Chihuahua State, Mexico. Nine (9) angle core holes have been completed for a total of 2,004 meters with an average hole depth of 222 meters in Target 1 in the northwest area. Core recovery has been good to excellent. Drill targets were identified by surface geological mapping, rock-chip sampling, and geophysics. These drill holes targeted high-angle structures that are similar to those that host gold-silver mineralization at the historic El Rosario mine (Aurico), 3 kilometres to the south. Similar structures also occur about 8 kilometers to the south on the Company's property. The purpose of the drilling program is to confirm the presence of structural zones, quartz breccia zones, and stockworks as the extension of the main NW-SE system. Many assays remain pending. Future drilling will offset holes containing anomalous gold and silver intercepts.
Target 1
Drilling commenced in an area with at least three prominent high-angle structures with anomalous gold/silver mineralization and some old surface workings. Angle hole LB-13 at -65° encountered 16.3 meters (not true width) of strong quartz breccia beginning at 22.3 meters and extending to 38.6 meters. Quartz breccia is a major ore host in the district and the intercept confirms the strong, NW-trending structural setting. Assays in the quartz-breccia structure show anomalous silver and gold with very sparse base metals. Anomalous silver values range from 0.7 to 4.4 gpt silver and higher gold values are 0.141 and 1.275 gpt gold. Lincoln geologists believe that the quart-breccia zone is high in the mineralized system.
Hole LB-14 was drilled at an angle of -45° about 70 meters along strike from hole LB-13 and encountered 12.5 meters (not true width) of good quartz, iron-oxide stockwork veining extending from a depth of 12.5 m to 52.0 meters. Assays are anomalous and range from 1.3 to 7.3 gpt silver and 0.102 to 0.420 gpt gold with very sparse base metals.
Hole numbers LB-15 and LB-16 were angled at -65° and -60° respectively and drilled to 151.5 and 181.5. These holes did not intercept any structures. Lincoln geologists believe that the structure is faulted out at these locations.
Hole number LB-17 was angled at -45° and drilled to 231.5 meters. The hole intersected a strong quartz-breccia, heavily oxidized zone from 22.5 to 26.6 meters for a thickness of 4.1 meters (not true width) which was preceded by a strong stockwork zone from 0.0 m to 22.5 meters for a thickness of 22.5 meters (not true width). Higher gold assays ranged from 0.136 grams to 0.652 gpt gold with elevated silver values. The main quartz breccia zone was intersected from 181.5 meters to 190.0 meters for a thickness of 8.5 meters (not true width) which was heavily sheared and broken and was preceded up hole by a good stockwork zone over 17.0 meters in thickness (not true width), all hosted in a rhyolitic intrusive. Anomalous assays range from 0.3 to 2.6 gpt silver with higher gold values of 0.650 to 0.754 gpt gold. Base metals are very sparse.
Hole LB-18 drilled to a depth of 220.5 meters at -45° cut an iron-oxide, hematitic stockwork with pyrite, all hosted in a rhyolitic intrusive from 28.5 to 37.5 meters for a thickness of 9.0 meters (not true width). Assays are pending.
LB-19 was drilled to a depth of 247.5 meters at -45° and cut heavy argillic alteration of quartz, iron-oxide stockworks and quartz breccia in several zones from 9.0 to 13.5 meters, 22.5 to 25.0 meters, 34.5 to 51.5 meters, 102.0 to 105.0 meters and 140.5 150.0 meters. Other quartz breccias with sulphides were intersected from 162.0 to 165.0 meters and 173.7 to 176.2 meters. No intervals represent true widths. Assays are pending.
Hole LB-20 was drilled to a depth of 255.0 meters at an angle of -65°. The hole also hit a stockwork and quartz breccia zone at 21.8 to 26.0 meters for a thickness of 4.2 meters (not true width) and also a quartz, iron-oxide zone from 26.0 to 39.0 meters for a thickness of 13.0 meters (not true width). Assays are pending.
The persistence of favorable structures, alteration and quartz breccias attended by consistent runs of anomalous silver and gold and very sparse base metals suggest that drilling to date is high in the mineralized system.
Target 2
Drilling has also started on stockwork zones over 30 meters wide (not true width) on Target 2, which lies 1,000 metres to the northeast of Target 1. Some of these structural zones were exposed at the surface by the bulldozer while cutting drill roads. Surface sampling has been conducted along the drill roads; assays are pending. Visual inspection shows shattered quartz veins and stockworks.
District Drilling
Drilling at Targets 1 and 2, 2,500 to 3,500 meters distant from the historic El Rosario mine (Aurico), indicates that the main mineralized structures can be identified for at least 5 to 8 kilometers in length in a northwest to southeast direction. In 2008 the Company drilled 12 core holes south of the El Rosario mine on Company ground (see June 23, 2008 press release). The main mineralized structures were also identified in that drilling program.
Quality Assurance and Control
Core is collected and handled only by authorized Company personnel who are trained in Company procedures. Core is transported after each drill shift to a secure prep and storage area in Guadalupe y Calvo where it is washed, measured, photographed, logged, and marked for sampling. Sample intervals are cut into equal halves with a diamond saw under the supervision of a senior geologist. One-half core is bagged and labeled with a unique sample number which is recorded. Certified standards and blanks are inserted into the sample sequence at a frequency of 5% standards and 2.5% blanks. Duplicate samples consisting of ¼ core are also inserted into the sample sequence where deemed appropriate. The samples are trucked to the ALS Chemex prep lab in Chihuahua where they are crushed, pulverized, split (250 g) and shipped to Vancouver, B.C., Canada for analysis.
ALS Chemex complies with, and is registered under, the international standards of ISO 17025:2005. As part of the analytical procedure, ALS Chemex maintains an internal system of duplicates, blanks and standards that are an integral part of each sample batch. ALS Global Laboratories quality assurance and assay procedures are described on their website. All samples are analyzed for gold using conventional fire assay and atomic absorption finish (Au-AA23). Multi-element analyses, including silver, are conducted by an inductively coupled plasma method (ME-MS41). Gold over limits are analyzed by fire assay with gravimetric finish. Silver over limits are analyzed by conventional fire assay. Second lab checks are conducted by Inspectorate on duplicate pulp samples. Pulps and rejects are returned to Lincoln for secure storage.
Mr. Jeffrey Wilson, the Company's Vice President Exploration and a "qualified person" under National Instrument 43-101, reviewed and approved the scientific and technical information contained in this news release.
Lincoln Mining Corp. is a Canadian precious metals exploration and development company with several projects in various stages of exploration and development which include the Pine Grove gold property in Nevada, the Oro Cruz gold property in California and the La Bufa gold-silver property in Mexico. In the United States, the Company operates under Lincoln Gold US Corp., a Nevada corporation.
On behalf of Lincoln Mining Corporation
Paul Saxton, President CEO
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