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科罗拉多金矿开采评估委员会对世界六大洲17个主要采矿国家作出的调查表明，金属矿山土地使用税平均略低于1％，而且在一些向自由市场经济过渡的经济不发达国家，土地使用税仍在继续减少。所调查的17个国家1992年各种金属的产量占市场经济世界总产量的比重为：金91％、铜84％、
A survey by Colorado’s Gold Commission on Assessment of Metals in 17 major mining nations on six continents shows that land-use taxes on metal mines average slightly less than 1%, and that in some underdeveloped countries that have transitioned to a free-market economy, land-use taxes Continue to decrease. The surveyed 17 countries accounted for 91% of the total output of various metals in the world market economy in 1992, 84% of copper,