露天采金法适合用于岩石地带,或蕴藏在地面 冲积土(Alluvial)的矿物,矿工用巨型铲斗机将地面上含金脉的岩石挖起来,然后用罗里运载到碎石部,将其压碎成粉状,然后才冶取黄金.
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alluvial fan [地理] 冲积扇 ; 冲击扇
alluvial deposit [地质] 冲积物 ; 冲积砂矿 ; 冲积土层
alluvial plain [地理] 冲积平原 ; 冲积系 ; 沉积平原
alluvial soil [土壤] 冲积土
alluvial cone 冲积扇
alluvial gold 冲积砂金
alluvial diamond 金刚石砂矿
alluvial terrace [地理] 冲积阶地 ; 冲积台地 ; 冲积河阶
alluvial clay 冲积黏土 ; 冲积粘土 ; 冲积土
ADJ Alluvial soils are soils which consist of earth and sand left behind on land which has been flooded or where a river once flowed. 冲积的 [技术]
At first light, I started my trek up an alluvial fan into an unnamed canyon in the Cottonwood Mountains.
天刚亮，我就从一片冲积扇区(峡谷山口的扇形沉积物)处开始了旅程，进入了卡顿·伍德山脉中的一个无名峡谷。
Although the region had experienced moderate seismic activity in the past, the city of Tangshan has been built on unstable, alluvial soil.
过去该地区曾经历过中度地震活动，唐山市的地基不稳定，土壤为冲积土质。
The Bangladeshi capital of Dhaka (with a population of 11.6m and rising) is built on alluvial terraces, exposed to flooding, earthquakes and rising seas.
孟加拉首都达卡(人口1160万，并程增长趋势)就建立在冲积台地之上，随时面临洪灾、地震以及海平面上升的危险。
"Because most of the gold deposits found in Sierra Leone, which had been worked on, were from the alluvial deposits.
VOA: standard.2010.04.22
He is one of many who have flocked to the Kangari hills in southern Sierra Leone to find small fortunes in the hard graft of alluvial gold mining.
VOA: standard.2010.04.22
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