美国矿业局公布的世界矿物储量与消耗比(见表)表明,如果今后二十年内世界处于相对和平,那就应有充足的矿物供应,为不断增长的世界人口提高生活标准。然而,大多数矿物储量估计得过低,而且通常的采矿实践是每采出一吨矿石要有一吨开拓矿量。本文所说的“储量”是能经济开采的部 The release of the world’s mineral reserves and consumption (see table) by the United States Bureau of Mines shows that if the world is relatively peaceful over the next two decades, there should be ample supply of minerals to raise living standards for the growing world population. However, most of the mineral reserves are estimated too low, and the usual mining practice is to have one ton of open pit ore per ton of ore produced. As used herein, “reserves” are economically exploitable units