More recent commercial discoveries include tantalum and tin , and there has been a rediscovery of something more enticing still : gold .
近来发现了更多有商业价值的东西,包括钽和锡,而且又一次发现了仍有更大诱惑力的东西:金子。
Minerals production rocketed in the 47 years up to 2007 ; copper , lead and lithium about fourfold and tantalum / niobium , used in electronic gadgets , by about 77 times .
Last year rebels took control of several tantalum mines in the democratic republic of the congo ; the government response cut 10 % of the global supply .
去年,在刚果民主共和国,反政府军控制了几个钽矿,这个政治冲突导致全球钽供应量下降了10%。
To control tantalum is to control a key part of the 21st-century supply chain : half of all tantalum mined goes into electronic capacitors , which store an electric charge .
Plus , dodd-frank legislation requires suppliers to document where their metals come from , adding as much as 2 % to the final cost , says kay nimmo of the tin & tantalum supply chain initiative .