The group visited the gold mining region of Samira before their disappearance, the ministry added.
The election had been marred by riots in Zambia's northern mining region.
Shops and restaurants in the mining region are short-staffed, hotels and flights are fully booked, and car-hire agencies have no vehicles to spare.
Mr Abbott kicked off his attack in the Hunter Valley, a coal-mining region of New South Wales, where he branded the tax a threat to coal's future.
ECONOMIST: The prime minister stakes her future on a divisive scheme
And other troubles lurk for big mining companies in the region.
Plan Nord is focused on opening up opportunity for permits, roads, infrastructure, to encourage more mining in northern Quebec, a region rich in diamonds, copper, molybdenum, rare earths and gold.
Union Pacific was no different but increased coal mining activity in Powder River Basin region situated in parts of Wyoming and Montana could reverse the slide in coal freight volumes for the company.
FORBES: Union Pacific's Coal Freight Business Chugs Ahead After Slowdown
But gold-mining is the new hope for the region, where Barrick, a huge Canadian firm, is opening several new mines.
ECONOMIST: Tanzania: President Kikwete's hard road ahead | The
There has been interest in the mining community in Latin America as a region of untapped resources, but Winmill said risks remain.
FORBES: Mining Share Weakness Could Have Many Reasons -- Midas Fund
But I am not shedding any tears and nor will a lot of people in this region and in many former mining communities throughout the country.
The government says the mining is illegal, but in this rural Muslim region of north-western Nigeria it has been going on for generations - and it was a discovery of greater deposits that has led to the recent boom in digging for gold.
Starting at the Bottom For now central Asian states have little to offer in the way of publicly traded companies, but investors can participate indirectly in the region via stocks such as Chevron, Newmont Mining and Turkcell.
The price of gold remained little changed on Monday, but did not stop gold miners across the region from rallying: in Australia, Newcrest Mining and Evolution Mining added 1.7% and 5.3%, while in Hong Kong Zhaojin Mining Industry and Zijin Mining Group climbed 6.3% and 2.4%.
Union Pacific has its network well spread in the PRB region, which has witnessed an uptick in coal mining activity lately.
FORBES: Union Pacific's Coal Freight Business Chugs Ahead After Slowdown
Apart from hunting and gathering, early farming techniques including meadows for fodder, trade and mining have been important ways for earning a living in the region.
And mining and other resource fortunes continue to feature significantly in the ranks of the region's richest.
He had campaigned against mining operators claiming that their activities violated the rights of indigenous people in the region.
This is a local, protecting angel, whose function is to link the mining past with the future and to focus the hopes and fears of a region struggling out of decline.
Tony Friday, chief executive of the Pilbara Regional Council, says some mining companies contribute "beyond what is reasonably expected" to host communities in the region.
All of which helps explain why the region has failed as yet to lure in much foreign direct investment, beyond mining and farming.
Caterpillar is planning to build a mining truck facility in Batam, Indonesia, to tap growing markets across the Asia-Pacific region.
FORBES: Caterpillar Digs Deeper Into China, Stock Worth $100
Miners in the country's Madre de Dios region have been demonstrating ahead of the enforcement of several decrees aimed at cracking down on illegal mining.
The region had been the soot-coated centre of Germany's coal and steel industries, but mining is being wound down and steel can be forged with many fewer workers.
ECONOMIST: The Ruhr��s attempt to reinvent itself takes a tragic turn
应用推荐