Vancouver's Mesa Exploration said on Tuesday that Utah state officials granted the company a 640-acre potash lease, sending its stock up 6.5% by the close of trade. Mesa announced the lease will be incorporated into its Whipsaw potash project in Grand County that now totals 18,608 acres or 29 square miles and where thick potash beds have been intersected in gas wells at depths between 3,300 and 4,200 feet.

Mountain Province Diamonds announced on Tuesday that the Gahcho Kué environmental impact study – all 11,000 pages of it – has been cleared and the review process – expected to take another two years – can now commence. Gahcho Kué, a joint venture between Mountain Province and De Beers, is the world's largest and highest grade diamond development project. It consists of a cluster of four diamondiferous kimberlites, three of which have a probable mineral reserve of 31.3 million tonnes grading 1.57 carats per tonne for total diamond content of 49 million carats.

Abhisam Software reports that it has launched its Hazard and Operability Study Technique course (HAZOP), a risk assessment tool for safety and operability in processing and industrial plants.

The HAZOP e-learning course is a blend of text, interactive animations and simulations using real life actual examples from industry, videos and graphics that enable easy understanding of the technique.

Silver Falcon Mining announced on Tuesday it had cast 17 troy ounces at War Eagle Mountain, making it the first report of precious metal smelting in over 100 years at the historic Idaho site. Stock in the tiny company rose as much as 24% on triple the usual volumes on the news bringing its gains for the year to over 72%. Silver Falcon said it will now switch focus from processing the old tailings and commence with exploration activities now that weather inaccessibility is no longer a problem.

Suriname's only commercial gold mine, the Rosebel Gold Mine which is majority owned by Canada's Iamgold, has been shut down by a strike by 1,100 workers protesting new longer shift hours. Rosebel is located some 118 kilometers south of Paramaribo (pictured), the capital of the South American nation. The mine produced 395,000 ounces in 2010 at cash cost of $484 per ounce. While Rosebel is the country's only commercially operated mine, there are believed to be thousands of small scale miners operating in the tiny, impoverished country.

Base metals miner Metorex is expected to delist from the JSE in early December, following the completion of a takeover by Chinese group Jinchuan which made a R9.1bn ($7.3bn) offer for Metorex last month. Jinchuan said that the acquisition of Metorex provided it with an opportunity to acquire a scalable African copper producer with a strong management team and substantial growth potential.

Cashed-up Rio Tinto is expected to post a first-half net profit of more than $US8 billion, driven by prices of iron ore, aluminium and copper. The earnings season gets into full swing tomorrow when the miner reports, with consensus among analysts for a 39.1 per cent jump in first-half underlying profit from $US5.77 billion to $US8.03 billion. The iron ore division is expected to contribute nearly 80 per cent of the net profit, lifting its performance by more than 50 per cent a year ago to about $US6.2 billion.

Australia's Treasurer Wayne Swan may soon have another foreign investment headache on his hands, as a Chinese entrepreneur says he has Beijing's backing to step around Australian investment rules and become the world's fourth force in iron ore. Liu Han, chairman Hanlong Group said the company could achieve it within 10 years, giving China ''a say'' in iron-ore price negotiations and stem as much as $80 billion in national losses flowing to the big producers.

A strike in South Africa's gold mining sector ended on Tuesday after a 2-year wage deal was clinched, unions and the Chamber of Mines said. The strike at AngloGold Ashanti , Gold Fields and Harmony began last Thursday and halted output worth up to $25 million a day at bullion's current record prices. About 100,000 gold mine workers will to return to work, starting with the Tuesday night shift. The companies' share prices extended gains on the news as gold scaled new highs over $1,635.00 an ounce on growing concerns about Europe's debt woes and anaemic U.S. growth data.