Alderan’s Frisco Project in Utah, USA hosts a large-scale porphyry copper-gold-molybdenum mineral system comparable in its setting to other world-class copper districts. The project hosts dozens of historical mines which focused on high grade mineralization found at or near surface.
Historical ownership across the Frisco Mineral System has been fragmented with local identity, Mr Page Blakemore Senior, dedicating much of his life to consolidating ownership of the private (patented) land. The historical fragmented ownership has provided a barrier to effective exploration of the Frisco Mineral System with previous explorers, including Kennecott (Rio Tinto), Teck Cominco and Newmont, limiting their work to small areas of the system. Alderan has built on the work of Mr Blakemore and taken the final steps to consolidate, for the first time, mineral rights across the entire system.
Mineralization is expressed in a variety of styles at Frisco:
- Copper skarn or carbonate replacement copper and base metal deposits often with significant precious metal credits (e.g. Accrington Skarn)
- reccia hosted copper-gold-silver mineralization (e.g. Cactus Mine)
In addition, historical exploration intersected copper-molybdenum mineralization within several deeper holes in Upper Cactus Canyon, which lies on the interpreted edge of the large Perseverance Porphyry Copper Prospect, identified by the Company in recent geophysical surveys.
Alderan´s Frisco Project in southwestern Utah lies in the western Cordillera of the United States, near the eastern side of the Great Basin. It is part of the southernmost of three major, sub-parallel polymetallic mineral belts of mid-Tertiary age containing most of Utah´s base and precious metal occurrences, including the Bingham Canyon porphyry deposit located 3 hours drive to the north, which has produced over 3 billion tonnes of ore from a mine that has continually operated for over 100 years.
Porphyry deposits are very large, polymetallic mineral systems that typically contain copper along with other important metals such as gold, molybdenum and variable amounts of silver, lead, zinc, tin and tungsten. Porphyry copper deposits account for approximately 60% of world copper production.
Porphyries typically contain 100 million to 5 billion or more tons of ore with a lower grade (typically 0.2% – >1% Cu). Their size makes these deposits amenable for bulk mining with a long mine life. Significantly large porphyry mineral systems can host large, economic mineral deposits not just in the primary copper stockworks associated with the porphyry, but in the adjoining skarns, breccia’s and epithermal or carbonate replacement deposits. The Bingham Canyon porphyry system, which has produced over 3 billion tonnes of copper ore, includes the large Carr Fork, North Ore Shoot, North Rim copper-gold skarns which hosted resources of over 150mt at 2.5% Cu, 1 g/t Au (refer to figure below).
Exploration of porphyry deposits focusses on developing an in depth understanding of the whole mineralizing system to vector in on the “sweet spots”. Expressions of mineralization within porphyry mineral systems depend on the depth level to which the mineral system is eroded.
Alderan´s Frisco project comprises all known surface expressions indicative for a large fertile porphyry system, namely the Cactus Breccia Pipe and the Accrington Skarn system, which are both high and low sulphidation epithermal areas, as well as mineralized felsic porphyries in outcrop and historic drillholes.