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  • AU: $1,484.39 USD
  • CU: $2.61/lb USD

Exploration History

The exploration and mining history of the AntaKori project and the Hualgayoc district is summarised in Table 1.

Dates

Company

Mining and Exploration Carried Out

pre-1532

Incas

Mined a hill at Chupicayacu (Quechua chupica - red, yacu - water), probably the Rio Colorado (AntaKori).

1771

Spaniards

Hualgayoc silver mines discovered. From 1771-1956 they produced 1,000-1,500 tonnes (32-48 million ounces (Moz)) silver, with some estimates as high as 4,000 tonnes (130 Moz).

1802

Alexander von Humboldt

Visit to Hualgayoc district by Alexander von Humboldt.

1859 & 1868

Antonio Raimondi

Visits to Hualgayoc by Antonio Raimondi. Most of the mines were abandoned, having exhausted the silver oxide ores.

1887 & 1893

Small companies

Introduction of smelting (1887) and sulphide leaching (1893) enabled sulphide ores to be processed and reactivated silver production in the Hualgayoc district. In 1904 there were 5 small smelters and 8 leaching plants.

20th century

Consolidation of companies

Consolidation of ownership of Hualgayoc district in 3 main companies. Compañía Minera Italía (1908), which became the Sindicato Minero Santa María de Hualgayoc (1927). Compañía Socavón Purgatorio (1908), became the Compañía Explotadora Minas de San Agustín (CEMSA) (1940), and the Compañia Minera Colquirrumi S.A. in 1970. The third miner was Sr. Eloy Santolalla. There were also many small miners.

Late 19th to late 20th century

Small companies

Small scale mining of massive sulphides at Sinchao (Antakori) to produce Cu, Au, Ag, Pb and Zn. Ore processed in plants at Tingo, Sinchao and Maria Eugenia.

1923

Northern Peru Mining & Smelting Corporation

Diamond drilled the Tantahuatay and Sinchao areas and identified a moderately large, low grade copper body.

1960

Kennecott

Carried out exploration (details not known).

1961-1964

Cerro de Pasco Corporation

Optioned 384 ha of concessions at Tingo-Sinchao. Carried out a topographic survey, geological mapping, mapping and sampling of all small mines, a self potential (SP) survey which identified 16 anomalies, magnetic survey, trenching, and drilled 4 diamond drill holes in 1964 (2 at Maria Eugenia, 1 at Cleopatra, 1 unknown). Estimated potential for 2 million tons at 2.5% Cu and 1-1.5 opt Ag. They described mineralisation in metasomatic replacement bodies along a limestone-intrusive contact. 

1961-1964

Cerro de Pasco Corporation

At Azufre (Tantahuatay) staked 17,000 ha. Carried out helicopter reconnaissance, geological and alteration mapping, soil and rock geochemistry, IP survey.

1967

Servicio de Geologia y Mineria (now INGEMMET)

Soil sampling program for porphyry copper deposits over 10 km sq on a 200 m grid at Tantahuatay and Sinchao. Found 7 anomalies with the largest at Quebrada Tantahuatay.

1960s

Mincosa

Regional exploration program.

1970

Kennecott

Drilled 2 vertical holes 100 m south of the Inquisicion pit.

1987

Granges

Exploration for massive sulphide bodies. Identified an area of 400 m by 100 m with 3-5% Cu in an ore-bearing horizon.

1995-1998

Southern Peru Copper Corporation (Asarco) and Buenaventura.

Explored Tantahuatay and drilled 30 diamond drill holes.

1996-1999

El Misti Gold Limited, Canada (El Misti Gold S.A., Peru)

Explored Sinchao. Soil grid 50 m x 50 m, geological mapping, 22.1-line km of IP-resistivity, 23.3-line km of ground magnetics. Drilled 22 x reverse circulation holes for 3,274.50 m in two phases in 1997-98, and 10 x diamond drill holes for 8,450.75 m in 1998.

1999-2006

Andean American Mining Corp., Canada (El Misti Gold S.A., Peru)

Change of company name on share consolidation. No drilling carried out. NI 43-101 technical report by Jaramillo (2006).

2006-2012

Sinchao Metals Corp., Canada (Compania Minera Sinchao S.A.C., Peru)

Andean American was acquired by Sinchao Metals Corp. 3D IP and ground magnetic surveys, geological mapping, geochemical sampling, trenching. Drilled 38 x diamond drill holes for 9,503.41 m in 2007-08. Released a NI 43-101 mineral resource estimate in 2008 (Jaramillo, 2008). In 2011 the resource was invalidated when the company announced that it did not own four of the tiles where 40% of the resource was located, and the project was written off.

2008

Gold Fields Limited

Started open pit mining of copper-gold sulphides at Cerro Corona.

2011

Compañía Minera Coimolache S.A.

Started open pit mining of a gold oxide orebody at Tantahuatay adjacent to the southern side of Sinchao (Antakori).

2012-2014

Southern Legacy Minerals Inc., Canada (Southern Legacy Peru S.A., Peru)

Southern Legacy acquired Sinchao Metals Corp. and renamed the project Antakori in 2012. No new exploration. Made a new NI 43-101 mineral resource estimate in 2012 (Wilson, 2012).

2014

Regulus Resources Inc., Canada (Southern Legacy Peru S.A., Peru)

Regulus Resources amalgamates with Southern Legacy Minerals.

2016-2017

Regulus Resources Inc., Canada (Southern Legacy Peru S.A., Peru)

Agreements signed with Compañía Minera Coimolache S.A. and Compañía Minera Colquirrumi S.A. for mutual rights of access, expansion and collaborative exploration around Antakori.

2017-2018

Regulus Resources Inc., Canada (Southern Legacy Peru S.A., Peru)

Phase One diamond drill program of 34 holes (30 holes drilled by Regulus and 4 holes drilled by Coimolache partially onto Regulus ground) for 19,601.23 m.

2018-2019

Regulus Resources Inc., Canada (Southern Legacy Peru S.A., Peru)

Drilling continues as Phase Two diamond drill program.

Table 1: Summary of the mining and exploration history of Antakori and the Hualgayoc district.


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