Hog Heaven Silver-Gold Project Summary
Hog Heaven is a high-sulphidation, silver-gold epithermal vein-breccia deposit with historical high-grade silver production.
- Historical estimate of 47.3 million ounces of silver and 225,800 ounces of gold(1);
- Past production by Anaconda Mining Company (“Anaconda”) (1929-1946) of 6.4 Moz Ag from 241,000 tons at an average grade of 26.6 troy ounces of silver per ton;
- Additional past production of 0.46 Moz Ag from 49,700 tons, grading 9.35 troy ounces of silver per ton by a lessee from 1963 to 1975; and
- Ore was shipped directly to smelters.
Location Map of Hog Heaven Project:
The property is located in Flathead County, 55 miles south-southwest of the town of Kalispell, in the northwest portion of state of Montana, USA. The property is easily accessible by driving 10 miles of gravel road from the highway.
The Hog Heaven Silver-Gold Project is wholly owned by Brixton Metals Corporation, subject to a 3% NSR to Pan American Silver.
The Hog Heaven mine historically (1929 – 1975) produced 6.4 Moz Ag from 241,000 tons at an average grade of 26.6 troy ounces of Silver per ton and 0.46 Moz Ag from 49,700 tons grading 9.35 troy ounces of Silver per ton. The ore was shipped directly to smelters. The mine was operated by Anaconda from 1929 to 1946 and by a lessee from 1963 to 1975.
A Feasibility Study was completed in 1988 by American Mining Services (pre-dating Ni-43-101) using a silver price of US$6.50/oz and a gold price of US$400/oz. A total of 6.4 Moz Ag at 26.6 oz/t Ag were mined and directly shipped to a smelter (1929-’46).
A historic silver and gold resource estimate exists for the Hog Heaven Project:
(1) Based on a historical estimate for Hog Heaven prepared by Gregory Hahn, Chief Geological Engineer for CoCa Mines Inc., a previous owner of the property, in a report titled “Hog Heaven Project Optimization Study” dated May 1989, prior to implementation of National Instrument 43-101 Standards of Disclosure for Mineral Projects (“NI 43-101”) (as disclosed in a prior owner’s resource statement [click to see News Release dated June 22, 2017] and based on diamond drilling. While Brixton considers these historical estimates to be relevant to investors as it may indicate the presence of mineralization, a QP for Brixton has not done sufficient work to classify the historical estimates as current mineral resources as defined by NI 43-101 and Brixton is not treating these historical estimates as a current mineral resource.
In the Hog Heaven Project Optimization Study, the historic estimate was sub-categorized as follows:
Little work has been conducted since the feasibility study.
Sources: Hog Heaven Mineral Property, Technical Evaluation Report, Robert J. Rodger, October 14, 1984; Hog Heaven Project Optimization Study Report, Gregory Hahn, Chief Geological Engineer for Coca Mines Inc., May 1989.
Several silver, gold and base metal mineralized zones occur as breccia and veins hosted by permeable units of volcanoclastic rocks. The high-sulphidation mineralization is accompanied by silicification of the host rocks. Silver is the metal of primary interest, although the gold and base metals are significant and could provide by-product revenues.
Chairman and CEO of Brixton, Gary R. Thompson stated, “The initial work will be to compile and digitize the historical data and to develop a 3D model and drill targets. The next step would be a drilling campaign to extend the known silver-rich zones, identify new mineralized zones and convert the historic unclassified resource to meet CIM definitions for mineral resources.”