Frik Els , Editor

Employees of diamond mining company De Beers are set to go on strike on Friday after wage talks broke down on Wednesday. The workers follow tens of thousands of others in South Africa's coal, metals and petroleum industries who have been on strike for weeks. The strikes come at a time when the country's mining output is slowing and new investment in the industry is drying up amid uncertainty about state ownership, taxation, an ever-changing regulatory environment and corruption. A recent ranking of top global mining investment destinations that puts Alberta at the top relegates South Africa to number 63 alongside Zimbabwe, Guatamala and Venezuela.

South Africa's Environmental Affairs department on Wednesday defended granting Coal of Africa approval to resume construction at the controversial Vele opencast project near Mapungubwe, saying science, not emotion, was behind the decision. Mapungubwe is a World Heritage site and home of the golden rhino figurine (pictured) that dates back to around 1000 AD when Southern Africa's earliest kingdom flourished. Construction of the mine were halted in August last year when it was discovered the Australian company did not comply with aspects of environmental management laws.

Thunder Bay-based Zenyatta Ventures has ended its dispute with Constance Lake First Nation after the leadership of the 1,470-strong community decided to no longer pursue a motion of injunction against the junior explorer in exchange for better co-operation and preferential job opportunities. Zenyatta can now advance its Albany project south of the so-called Ring of Fire in the James Bay lowlands where it is exploring for nickel and platinum group metals with a purported value in excess of $1 billion.

Interfax reports a few dozen people protested Tuesday outside Romania's Culture Ministry in Bucharest against its approval of the archaeological discharge certificate for the Carnic Mountain, where extensive tunnels used by Roman miners during the rule of emperor Trajan (pictured) still exists. Rosia Montana Gold Corporation, controlled by Canada's Gabriel Resources which first obtained the concession in 1999, needed the permit for its project to establish an open-cast mine in the area believed to hold some 300 tonnes of gold, one of the largest deposits in Europe.

Alberta should establish an independent agency to monitor the environmental impact and pollution from oil sands development, an independent panel told the provincial government in a report released Tuesday. The Alberta Environmental Monitoring Panel was formed in January under pressure from environment groups when questions emerged over the quality and comprehensiveness of environmental reporting on the oil sands. Canada's oil sands also come under fire recently when it was revealed that the federal government deliberately excluded data indicating a 20% increase in pollution in a climate change report to the UN.

Oilsands Quest stock was trading down around 15% in early afternoon trade on Tuesday after the company announced it was hoping to raise $60 million in a rights offer to advance its flagship Axe Lake oil sands project in Saskatchewan. The company is offering existing shareholders 300 million rights at a 40% discount to the share price last Friday, a day on which Oilsands Quest rocketed more 61% on 10-times usual volumes after Saskatchewan converted its Axe Lake permits to 15-year leases. The company has been forced to raise money and go it alone after a fruitless 11-month quest to find a strategic partner.

When a 4.5% jump in stock price with 15 million shares changing hands on news of the acquisition of three new concessions is considered a dull trading day then you know you're dealing with a volatile stock. Portage Resources has gone from 2c to 65c a share in the matter of three months but the Peruvian explorer has certainly not been a one-way bet – the stock's 52-week high is $1.24. The company based in Miraflores, Lima (pictured) has been snapping up silver properties in Peru, but after announcing silver reserves worth $2.3 billion at one of them the stock has been unstoppable.

BHP Billiton's friendly $12 billion takeover of the US gas company Petrohawk is the group's largest in six years, and its most ambitious foray into the controversial business of shale gas extraction through a process called hydraulic fracturing or fracking. While the transaction is a coup for Petrohawk – its shares duly rose 65% to match the takeover price – analysts are skeptical about the prospects of BHP Billiton, the world's most valuable miner, making a success of the deal considering its poor track record with acquisitions, its relatively limited experience in the fracking business, environmental concerns and warnings that it is again buying at the top of the cycle.

"As the fifth-biggest consumer of diamonds, a stake in a diamond mine would be interesting," the CEO of Swatch Group, Nick Hayek told the Finanz und Wirtschaft newspaper on Saturday. The world's largest watchmaker, which apart from cheap and cheerful Swatches, also owns luxury brands Breguet, Blancpain, Glashütte (pictured), Omega and Tiffany & Co, said demand for watches studded with diamonds has increased explosively and the desired quality are only available in small quantities. According to IDEX research global polished diamond prices rose sharply during the second half of June, and are showing no signs of a pull-back.

Rescue work in a flooded coal mine in Guizhou Province has been terminated, 14 days after a flood trapped 23 workers underground. The rescue work in Niupeng Mine, located in Pingtang County, was halted at 4 p.m. Saturday. The miners were very unlikely to be alive, according to an assessment by rescue experts. Twenty one workers remain missing while two bodies have been retrieved from the mine. The area where the miners are believed to be has been completely submerged. While 406,000-cubic meters of water had been pumped out during the past 14 days, flood water was still pouring into the pit.