Santo Tomas Copper Porphyry
The Santo Tomas Copper Porphyry deposit is part of the Laramide age belt of copper deposits stretching from Arizona to Northern Mexico. It contains Copper, Gold, Silver, and Molybdenum.
Location[edit]
The Santo Tomas deposit is located near Choix, Sinaloa, Mexico, in the Western Sierra Madre mountain range and straddles the borders of the State of Sonora to the South and State of Chihuahua to the North. It is at the southernmost side of the Santo Tomas Copper District. This District includes the Reforma and Jinchuan owned Bahuerachi deposits extending 14 km to the North East.
Geology[edit]
Santo Tomas is a Paleocene aged deposit ~57.2 Ma */- 1.2 Ma.[1] Santo Tomas Property resides within the Sonora-Sinaloa batholith on the western flank of the Sierra Madre Occidental. This area contains multiple phases of intrusive rock ranging in composition from diorite and tonalite to granite and quartz monzonite. The emplacement of intrusions was partially controlled and subsequently offset by several phases of faulting. Late faulting has served to expose both the shallow and deeper levels of the intrusive bodies and associated hydrothermal systems.
History[edit]
Copper at Santo Tomas was discovered by ASARCO, a subsidiary of Grupo Mexico, in the late 1960s. In 1973 Penoles acquired the property and reported precious metals including Gold and Silver.
More recently the deposit was worked on by Exall Resources in the 1990s reporting the deposit contains Molybdenum and completing a pre feasibility study by Bateman Engineering in 1994. Bateman recommended the project proceed to full feasibility.[2] Due to weak metals prices the property had remained largely forgotten until it was acquired by Oroco Resource Corp. in 2019.
Cumulative work on the property now totals 106 drill holes covering 30,000 meters.[3]
Reserves[edit]
In a 1995 News Release, Exall Resources stated the Santo Tomas Deposit total tons of ore were 1.018 billion tons for a contained 7.4 billion pounds of copper, 1.2 million ounces of gold and 22 million ounces of silver.[4] Production from a 60,000 ton per day operation would produce 306 million pounds of copper, 69,000 ounces of gold and 2.3 million ounces of silver annually.[5]
References[edit]
- ↑ "Santo Tomas, Porphyry copper deposit". mrdata.usgs.gov.
- ↑ "Santo Tomas Copper Prospect Near El Fuerte, Mexico". The Diggings™.
- ↑ "Home". Oroco Resource Corp.
- ↑ "Stockwatch". www.stockwatch.com.
- ↑ "Free Article Limit Reached". www.northernminer.com.
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