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Excelsior Mining Reports Positive Preliminary Metallurgical Test Results

Preliminary results from metallurgical test work at Excelsior Mining's Gunnison project in Arizona show that copper can be recovered rapidly and uniformly from fractured rock samples from the property. However, what's perhaps more important is that copper recoveries and acid consumption for the leaching process are consistent with results from the company's 2014 prefeasibility study.

Rio Tinto, Mongolia Reach Agreement for Massive Oyu Tolgoi Expansion

Rio Tinto and the government of Mongolia have reached an agreement to move forward with a massive underground expansion at the Oyu Tolgoi copper mine. Development of the $5-billion underground mine has been stalled since 2013 due to disagreements between Rio and the government over taxes and costs for the project.

Atico Mining Gains on High-grade Drill Results at El Roble

Atico Mining put out impressive drill results from its El Roble mine in Colombia on Wednesday. It reported grades of 6.26 percent copper and 1.85 g/t gold over 70 meters in one hole. An intercept of over 6 percent copper is nothing to shake a stick at, and there was definitely a reaction from the market in response to that results.

Drill Tracker Weekly: Nevsun Extends Massive Sulfide Mineralization at Harena Deposit

Nevsun Resources announced drill results from 2015 drilling on the Harena VMS target, located 10 kilometers south of its operating Bisha copper-zinc-silver-gold mine in Eritrea. Highlights from the step-out drilling include: 67.2 meters grading 1.66 percent copper, 6.62 percent zinc, 0.41 g/t gold and 28 g/t silver.

Eurasian Minerals Options Arizona Copper Project to Kennecott Exploration

Royalty and prospect generator Eurasian Minerals kicked off the week by announcing it has optioned its Superior West copper project in Arizona to Kennecott Exploration. Kennecott is owned by Rio Tinto, which also owns the massive Resolution copper project in Arizona in partnership with BHP Billiton.