Orex Minerals Inc.
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Orex Minerals Inc. Projects

Orex Minerals Inc. Orex Minerals Inc.
Coneto de Comonfort,
Durango, Mexico

Our Coneto Silver-Gold Project is located in the Mesa Central, on the eastern flank of the Sierra Madre Occidental Mountains. It is situated in the region around the village of Coneto de Comonfort, in Durango, Mexico.

Coneto de Comonfort has a municipal population of approx. 4,000 people, which provides a good source of local labour & services.

Also, the local infrastructure is excellent:
  • On the national electric power grid
  • Paved road leads to center of project
  • Many additional gravel access roads
  • 35 km east - nearest major highway
  • 100 km south - city of Durango

Orex has 100% ownership of 15,700 hectares of mineral concessions at Coneto. Fresnillo brings to the joint venture a further 1,900 hectares, for a contiguous land package of 17, 600 hectares. (about 45,000 acres)


The historic Coneto Mining District is situated in the heart of the "Mexican Silver Trend" which stretches from Guanajuato in the southeast, through to the states of Zacatecas and Durango.

The trend hosts some of the world's largest silver deposits, including:
  • Fresnillo - largest primary Ag-Au mine in the world & past billion oz Ag producer.
  • Guanajuato - past billion ounces Ag producer with 3 currently producing mines.
  • La Colorada - current producing mine of Pan American Silver.
  • La Pitarrilla - major development project of Silver Standard Mines.
  • La Preciosa - major development project of Coeur d'Alene Mines Corp. (previously Orko Silver).
  • Real de Angeles - past AG-Zn-Pb producer in Zacatecas State.
  • Zacatecas - past 750 million ounce AG producer.


Orex's initial exploration program consisted of detailed structural geology mapping & geochemical sampling in the areas around Estrellas-Calaveras, Colimanito, Descubridora, Bufa, Promontorio, Promontorio Sur, Loma Verde, Sauces-Palma, Durazno and Impulsora. Fresnillo continues exploration in these areas as well as Indio, San Maritano, Santo Nino, and Impulsora Sur.
  • Phase-I Reconnaissance Drill Program completed
    • 5,000 m (15,750 ft)
    • 21 Holes on 7 targets
  • Important hits made in Phase-I:
    • Loma Verde: Hole CC-10-20 yielded true thickness of 3.12 m grading 0.982 g/t Au and 291.6 g/t Ag for a silver-equivalent of 350.5 g/t (or gold-equivalent of 5.824 g/t)
    • Impulsora: Hole CC-10-12 yielded true thickness of 4.60 m grading 1.596 g/t Au and 114.7 g/t Ag for a silver-equivalent of 210.5 g/t (or gold-equivalent 3.508 g/t)
  • Phase-II Diamond Drill Program completed under the joint venture with Fresnillo PLC. Important hits made in Phase II:
    • 12,000m (39,000 ft)
    • 31 Holes on 8 targets
  • Important hits made in Phase-II:
    • Loma Verde: Hole BCO-02 yielded true thickness of 10.27 m grading 3.08 g/t Au and 138 g/t Ag for a silver-equivalent 300 g/t
    • La Bufa: Hole BCO-11 yielded true thickness of 5.23 m grading 2.41 g/t Au and 129 g/t Ag for a silver equivalent of 256 g/t
    • Santo Nino: Hole BCO-11 yielded true thickness of 2.70 m grading 4.34 g/t Au and 612 g/t Ag for a silver equivalent of 840 g/t

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Exploration objectives for our Coneto Silver-Gold Project are similar to our sister project - Orko Silver Corp's La Preciosa Silver-Gold Deposit. Orex is exploring for a target deposit size of more than 100 million oz of silver equivalent.


Orex has signed an Association Agreement with Fresnillo PLC to explore the Coneto Silver-Gold Project. Orex and Fresnillo hold extensive contiguous mineral concessions in the Coneto Mining District, which collectively total approx. 17,600 hectares (43,000 acres) and cover more than 40 known mineralized epithermal quartz veins. A joint technical committee, with both Orex and Fresnillo representation, will manage Coneto.

Fresnillo PLC will complete the following work:
  • High-resolution mapping
  • Negotiate community permits
  • Continue environmental studies
  • Conduct airborne geophysical survey

Fresnillo PLC has an option to spend up to US $6,000,000 USD before February 2015 to explore the Coneto Silver-Gold Project in order to earn 55% ownership, and has the right to earn 70% ownership by advancing Coneto to the pre-feasibility stage, or by spending US $21,000,000. As of August 2013, Fresnillo PLC has spent $3,400,000.


Coneto - Historic Mine Workings
With a history of more than 400 years, Coneto has been a mining camp since the days of the Conquistadores. Over 40 veins of silver & gold have been documented in the Coneto mining camp, some over 20 m wide and extending more than a km in length. Very little diamond drilling had occurred on the property. However, drilling records from the 1970s yielded grades of 2.35 g/t Au and 224 g/t Ag for a silver equivalent of 365 g/t over 3.15 m in Loma Verde, part of the western vein system. The central vein system was also mined in the 1970s by private companies. Mining on several veins has only gone as far down as the water table, yet the veins continue below that level.

Silver-equivalent determined as silver grade plus 60 times gold grade, the 10-year average metal price ratio on the London Metal Exchange. This also assumes 100% recovery, and does not include a contribution from base metals, nor fluorite.


The central vein system was mined most recently by private companies for silver & gold in the 1970s, but closed in the early 1980s due to a drop in silver prices. The Palma and the Sauce veins were mined down to the water table.

Coneto - Durazno Mine Portal
The eastern vein system has been mined to extract 'fluorite' from the Durazno and Impulsora veins. In places, the vein is 20 m thick. These operations mark a high level in the epithermal vein system. The eastern vein system shows an increase in sulphides & precious metals with depth.

The western vein system was drilled with one hole in the late 1970s, in the Loma Verde vein. Gold & silver results were strong and while a follow-up program was planned, it was never executed. In Phases I and II a further 12 holes have been drilled in Loma Verde.

Additional vein systems are located in target areas to the North (La Bufa, Cerro Prieto, Rosario), the South (Calaveras, Colemanito, Promentorio, Indio, San Maritano) and the West (Naga Nega).


Impulsora - Historic Mine Workings
The area exhibits an extensive system of hydrothermal alteration indicative of the presence of mineralization. Low to intermediate-sulphidation epithermal silver-gold quartz veins are in a window of Tertiary age lower volcanic group andesites, the same rock formation which hosts other similar silver-gold deposits. The mineral zonation shows that Coneto is high in the epithermal system and that the system is preserved. In this type of deposit, the top is fluorite rich, zoning to precious metals followed by base metals. Similar deposits in Mexico have mineralized vertical extents in the 300 m - 600 m range.


CN Santo Niņo Trench Map
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CN Loma Verde Trench Map
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Coneto - Impulsora Trenching Map - August 2013
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Orex Minerals Inc.