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H.W.斯查瑞伯和M.E.伊摩逊1984年3月6日,在加拿大多伦多勘查与开发工作人员协会会议上作的:“北美金矿床产生的储量成本与现金支出”报告中,有美国近23年金属矿勘探支出费用统计资料.这项资料包括美国三十家国内和外国大公司的支出,不包括铀和工业矿产(industrialIninerals),有的公司已知包括铀和煤的支出,但数额不能划清.除按当时币值显示,为了可比,还以1983年为100,将历年数字用美国国民生产总值绝对价格指数作了调整.
HW Scharrebor and ME Emerson At a meeting of the Association of Prospectors and Developers in Toronto, Canada, March 6, 1984, “Near North American Gold Deposits Produced by Costs and Cash Expenses” report was nearly 23 in the United States Annual survey of expenditures on metal exploration expenditures, which includes expenditures by the 30 largest domestic and foreign companies in the United States excluding uranium and industrial minerals, some companies that already know including uranium and coal but not in that amount In addition to showing the current currency value, for comparable purposes, the figure for 1983 was also set at 100, adjusting the historical figures against the absolute price index of the United States Gross National Product.