Copper

Workers at BHP Billiton Ltd. (BHP)’s Escondida copper mine, the world’s biggest, began striking as coal miners at the company’s Australian operations prepared to escalate industrial action. The strike by all union members at the northern Chilean mine began at 8 p.m. New York time yesterday with the changing of a shift and will run through to 8 p.m. today, which may lead to about 3,000 metric tons of lost copper production, union leader Jose Vidal said by telephone. Image of BHP's Escondida mine is by BHP Billiton.

Freeport-McMoRan Copper & Gold Inc. is studying further expansion of mining and milling operations at Morenci, the company said today as it announced that its second-quarter profit doubled.

Copper futures retreated Thursday, snapping Wednesday’s rally to a three-month high, as negative sentiment over China’s economic future outweighed better-than-expected US manufacturing data.

Newcrest Mining, Australia's largest gold mining company, reported on Thursday that gold production rose 16% to 700,124 ounces during its June quarter. Copper production was slightly higher than the previous quarter at 20,127 tonnes. The company said cash costs of A$542 per ounce were higher than the previous quarter due to higher site costs and lower copper byproduct credits per ounce.

Copper fell to its lowest in almost a weak on Thursday as data showed the factory sector in top metals consumer China shrank in July, but losses were capped by a softer dollar and hopes of a resolution of the Euro debt crisis.

City broker UBS says global mining firm BHP Billiton's (LON:BLT) June production figures were slightly better than expected and gives the stock an unchanged 12 month rating of a 'buy' with a target price of £28.40. The mining giant released the figures yesterday across the spectrum of its resources, including iron ore production up 14 percent year-on-year in the final quarter.

PT Freeport Indonesia (PTFI) Geo Services Division recently enhanced the slope monitoring system at Grasberg mine with the purchase of two IBIS-M radars. “Grasberg mine is one of the few mines in the world that utilises very high-technology monitoring equipment to help detect slope movements. The IBIS-M radars are top-of-the-line radars, using technology that is accurate to within approximately 0.1 mm, with coverage at some 2 km an area around 5 km square, and operating range of 10 m to 4,000 m,” explained PTFI Superintendent - Geotechnical Pit Engineering and Stability Rahadian Widiadi.

Harmony Gold Mining upgraded the resource estimate for its Wafi-Golpu project in Papua New Guinea on Wednesday increasing it by 57% to over 1 billion metric tons, making it one of the highest grade copper-gold porphyry systems in South East Asia. CEO Graham Briggs said it was a "game-changing asset" for the company and the latest drilling results bring the Wafi-Golpu deposits within sight of Freeport-McMoran’s Grasberg mine across the border in West Papua, Indonesia, which was recently hit by strikes.

Curis Resources Ltd. (TSX: CUV) ("Curis" or the "Company") reports a formal update on activities at the Company's flagship advanced stage Florence Copper project in central Arizona, USA.