【英刊《一九七五年采矿年评》报道】一九七四年,苏联铁矿工业有地下矿山七十一座,露天矿山六十三座,总生产能力约二亿五千万吨。其中有百分之八十来自露天开采,将近半数来自七个重点露天矿,每家产量超过一千万吨。一九七四年商品矿石的产量为二亿二千五百万吨(原矿为四亿二千五百万吨),一九七五年预计为二亿 According to the British Annual Mining Review of 1975, in 1970, the Soviet iron ore industry had 71 underground mines and 63 open-pit mines with a total production capacity of about 250 million tons . Eighty-eight of these are from open-pit mining, with nearly half coming from seven key open pit mines, each producing more than 10 million tons. In 1974, the output of commodity ore was 225 million tonnes (425 million tonnes of crude ore) and 200 million by 1975