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法国布里塔尼(Brittany)半岛地区的圣雷南锡矿是欧洲少有的锡矿床之一。砂锡矿层位于地表下0.5～1米处,层厚3～8米(含粘土20～40%)。矿层中锡含量达300～600克/米~3,砂锡粒度为0.5毫米。在采掘作业中原使用900匹马力的吸入型挖泥船,但由于砂泵的外壳剧烈磨损以及消耗大量动力,以后又改采用了装于浮船(Pontoon)上的迴转式抓岩机吊车(Grab crane),抓斗容量为9吨。浮船长23.1米,宽13.0米,高1.7米,其上并装设选矿设备及450千瓦的发
The Saint-Renan tin mine in France’s Brittany Peninsula is one of the few tin deposits in Europe. Sand tin ore layer is located 0.5 to 1 meter below the surface, the layer thickness of 3 to 8 meters (including clay 20 to 40%). The content of tin in the ore layer reaches 300 ~ 600 g / m ~ 3, the particle size of sand tin is 0.5 mm. The original 900-horsepower suction dredger was used in the excavation operation. However, due to the drastic wear of the sand pump casing and the large amount of power required, a rotary gravel crane mounted on a Pontoon (Grab crane), grab capacity of 9 tons. The pontoon is 23.1 meters long, 13.0 meters wide and 1.7 meters high, with dressing equipment and 450 kilowatts of hair on it