Cyprium Mining (CUG-V) June 20, '16 is pleased to announce the results from nine underground samples taken from an oxidized zinc body on level 14 as part of its ongoing exploration program of the Potosi silver mine located in Santa Eulalia, Mexico.
The nine samples were taken from level 14 of the Santo Domingo body and averaged 37% Zn over an average sample width of 1.53m. The oxide zinc material is mainly hemimorphite, a zinc silicate mineral, and contains variable but generally low concentrations of lead, iron and manganese. Given the positive nature of these results, Cyprium has taken an additional thirty-five samples from level 14 which will be sent for analysis shortly. Oxidized zinc material is different from the more usual zinc sulfide produced by flotation in most zinc mines, including in most areas of the Potosi mine, and requires different processing techniques to recover the zinc metal.
AREA
| SAMPLE
| Width
| Ag g/t
| Pb%
| Zn %
| Fe%
| Mn%
| SANTO DOMINGO
| 156472
| 1.00
| 27
| 0.71
| 38.79
| 7.78
| 1.31
| SANTO DOMINGO
| 156473
| 1.50
| 24
| 0.70
| 40.69
| 2.97
| 1.18
| SANTO DOMINGO
| 156474
| 2.30
| 20
| 0.94
| 41.18
| 8.39
| 0.61
| SANTO DOMINGO
| 156475
| 1.50
| 21
| 0.27
| 48.77
| 2.76
| 0.11
| SANTO DOMINGO
| 156476
| 1.50
| 16
| 3.45
| 21.10
| 23.00
| 1.45
| SANTO DOMINGO
| 156477
| 2.00
| 26
| 0.37
| 47.36
| 3.28
| 0.07
| SANTO DOMINGO
| 156478
| 2.00
| 21
| 0.99
| 36.62
| 7.13
| 0.21
| SANTO DOMINGO
| 156479
| 1.00
| 8
| 1.88
| 19.30
| 24.10
| 0.24
| SANTO DOMINGO
| 156480
| 1.00
| 9
| 1.10
| 24.80
| 27.50
| 0.06
|
|
| 1.53
|
|
| 37.06
|
|
|
Mr. Alain Lambert, Chairman and CEO of Cyprium stated: "The results announced today are part of an ongoing exploration program to evaluate the potential of different known mineralization in the Potosi mine. The Santo Domingo body where the samples were taken, also known as Main Silicate body, was partly mined in the past and efforts are underway to determine the volume and grades of remaining material. This area is not accessed by the recently rehabilitated Potosi No. 3 shaft that will be used to provide services such as compressed air and for haulage of broken mineralized rock from Tunel body on levels 2-4 (see News Releases of June 9 and 13, 2016) where underground development and exploration will begin shortly."
Mr. Lambert concluded: "Exploration around the Main Silicate body at level 14 and eventually at levels 9 and 10 around the Potosi No. 5 shaft will provide us with valuable information that will be used to make a decision regarding means to gain access to that body, including the eventual rehabilitation of Potosi No. 5 shaft."
Past production from the Santo Domingo body was from the Potosi No. 1 and Potosi No. 5 shafts and from the Buena Tierra shaft on neighboring ground controlled by Grupo Mexico. Proposals for gaining shaft access to the Santo Domingo body are currently under consideration.
Mineralization in this area is exposed in a large chimney that extends over several levels. Although most of the mineralization on the upper levels of the Potosi mine is oxidized, local areas with preserved sulfides on the upper levels were discovered in the last few decades (1). The main exposures of sulfide mineralization studied to date are on levels 9 to 11, but the sulfide material also extends upward to level 6. Such sulfide orebodies were not economically exploitable prior to the advent of selective flotation in the early 1900's and were evidently left behind for this reason and later forgotten. These "perched" sulfide bodies were possibly preserved due to the vagaries of past oxidation. Assay results for samples of sulfide mineralization from Levels 6, 9, 10 and 11 on the replacement body were announced previously (see News Releases of August 12 and September 3, 2015).
The Santa Eulalia District
Santa Eulalia is a world class polymetallic mining district located in the central part of the State of Chihuahua, Mexico, approximately twenty-two kilometers east of the City of Chihuahua. Mineralization in the area was originally discovered during the Spanish colonial period in the 1500's, and recorded production has occurred over more than 300 years. Santa Eulalia ranks as one of Mexico's primary silver and base metal producing districts with nearly 450 million ounces of silver and substantial amounts of lead and zinc mined. The nature of the deposit in the Santa Eulalia district is a carbonate replacement deposit and is the historically largest of its type in Mexico. Mineralization occurs in an area about 10 km in length and 5 km in width. Production and reserves for the district have been estimated to be about 50 million metric tons (2) with grades of 125-350 g/t Ag, 2-8% Pb and 3-12% Zn (2) (3), along with appreciable quantities of tin and vanadium.
The Santa Eulalia district covers approximately forty-eight square kilometers and is divided into three areas, the West Camp, the Central Camp and the East Camp. The Potosi silver mine is located in the West Camp. The West Camp has produced most of the minerals from the district from an area 4 km long in a north-south direction and 2 km wide in an east-west direction, with the Potosi silver mine being one of the primary producers.
Based on the geology, past mining activity and the exploration work completed by the Company to date, the Potosi mine, the Company believes that the project warrants further exploration. Widely spaced sampling on levels 3-4 in the area of the Potosi No. 3 shaft (Tunel body) and levels 6 and 9-11 in the area of the Potosi No. 1 shaft (Santo Domingo or Main Silicate body) has shown that mineralized material of interesting grades is exposed at the margins old stopes and adjacent areas, and this work will continue in order to evaluate the potential for defining resources.
Geological Setting, Deposit Type and Mineralization
Mineralization in the Santa Eulalia district is characterized by massive sulfides, dominantly pyrrhotite, sphalerite, galena and pyrite that are hosted mainly in horizontal mantos and steep chimneys of sulfide material that replace limestone, with some breccia bodies also occurring. Mineralized bodies occur along laterally continuous discrete structural zones that mainly trend in a north-south orientation, with mineralization forming preferentially in certain stratigraphic units. Past mining has reached to as much as 700 meters depth below the surface on 21 levels. Production in the West camp was diminished until the late 80's with the discovery of new mineralization. Currently there is little production in the district.
National Policy 43-101 Report
Cyprium has engaged Dr. Craig Gibson to complete a National Instrument 43-101 report with respect to the initial mine levels 2, 3 and 4 of the Potosi silver mine. It is expected the report will be completed before the end of June 2016. The report to be prepared by Dr. Gibson shall not contain a resource or reserve calculation.
Quality Assurance and Control
Samples taken in underground workings are typically channel samples. Sample cuttings consist of rock chips taken along pre-marked channels approximately 15-20 cm in width that span the mineralized zone and are collected at the site by an experienced sampling crew under the supervision of a Company geologist. Sample material, consisted of from 2.0 to more than 4.7 kg of material, was placed in labelled plastic bags that are sealed with ties at the collection site. The samples are then transported from the mine and stored at the Company's or contractors surface facilities or are taken directly to the lab preparation facility. The samples are transported in Company vehicles and delivered to the sample preparation facility by personnel of the contractor.
All samples were analyzed in Vancouver for the reported metals by the ME-OG62 method for higher grade samples. Samples with more than 30% zinc were analyzed by the Zn-VOL50 potentiometric titration method using a 4 acid digestion. For these initial high grade samples, internal control samples were not used, but the laboratory applies strict quality control procedures. ALS Chemex is part of ALS Global, an internationally recognized analytical laboratory.
Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.
Qualified Person: Dr. Craig Gibson, Certified Professional Geologist, prepared the summary of public historical information on the Santa Eulalia district, and has reviewed the appropriate portions of this news release and approved the contents thereof. Public information included in this release are based on work by from a PhD dissertation by Peter K. M. Megaw and information from the Mexican Geologcial Survey (Servicio Geologico Mexicano).
References:
(1) P. Megaw, pers. Comm.
(2) Megaw, P.K.M., 1990, Geology and geochemistry of the Santa Eulalia mining district, Chihuahua, Mexico, unpublished PhD dissertation, University of Arizona, 461 pp.
(3) Bustos-Diaz, J.L. and Arzabala-Molina, J., 2007, Monografia Geologico-Minera del Estado de Chihuahua, Servicio Geologico Mexicano, 640 pp.
SOURCE Cyprium Mining Corporation
About Cyprium Mining Corporation:
For further information, please contact:
Alain Lambert, Chairman and C.E.O.,
E-mail: ir@cypriummining.com ;
Ron Keenan, C.O.O.,
E-mail : rkeenan@cypriummining.com ,
Phone + 1 514 915 3836,
Website: www.cypriummining.com |
