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某砂金矿某段勘探工作82年一季度已基本结束，但提交储量报告必须进行选矿试验，以了解砂矿石的物理性质、砂金粒度及形状、砂矿可选性分类等。该砂金矿属现代河床冲积型，砂金矿体埋藏在现代河床平水期水位以下，浅井无法施工，采取试料的手段就要用大口径砂钻代替浅井。设计钻孔43个，进尺310米，采取砂样15.22米~3。河床长6450米，钻孔分布于12条勘探线上，线距400—600米，每条线选一个以往完工的钻孔，在其周围5米布2—4个钻孔。如果
Certain exploration work for a certain gold mine has basically ended in the first quarter of 82 but the mineral reserves test must be carried out to submit the reserves report to understand the physical properties of sand ore, the size and shape of gold dust, and the optional classification of sand. The sand gold deposit is a modern alluvial riverbed, gold sand body buried in the modern river bed below the water level, shallow wells can not be constructed, the means to take the sample will use large-diameter sand drill instead of shallow wells. 43 holes were designed, the footage was 310 meters and the sand sample was 15.22 meters ~ 3. The riverbed is 6,450 meters in length with holes distributed over 12 exploration lines with 400-600 meters of line spacing. Each of the lines selects a previously completed borehole and 2-4 holes around 5 meters. in case