| 摘要：正 残积矿床富的残积锡矿床现在已不易找到。这种矿床目前只有很少几个地方仍在开采。矿床的开采，最初集中在河流下游，后来扩展到上游。在有残积富矿的地带，一般原生矿都隐伏在下部。 一般来讲，残积矿的价值较高，泰语论文范文，从地表到底部，矿层的含锡量没有多大变化。这和砂锡矿床不同，泰语论文题目，后者富矿部分多集中在含矿层的最底部，或是可采矿层直接覆盖在基岩上。残积矿的厚度一般在1～2米，最大不超过3米。在几英亩范围内的 Abstract：Orthoeluvial deposit rich residual tin deposit now is not easy to find. This deposit at present only a few places still in mining. Mining deposits, initially concentrated in the lower reaches of rivers, and later extended to the upstream. In the residual ore zone, are buried in the lower part of the general primary ore. Generally speaking, the higher value of residual ore, from the bottom surface, the amount of tin ore is not much change. The placer tin deposit is different, rich part of the focus at the bottom of ore bearing layer, or is mining layer directly overlying the bedrock. Residual ore thickness is generally 1 ~ 2 meters, a maximum of not more than 3 meters. In the range of a few acres 引言：残积矿床 富的残积锡矿床现在已不易找到。这种矿床目前只有很少几个地方仍在开采矿床的开采,最初集中在河流下游,后来扩展到上游。在有残积富矿的地带,一般原生矿都隐伏在下歌 一般来讲,残积矿的价值较高,从地表到底部,矿层的含锡量没有多大变化这和砂锡矿床不同,后者富矿部 |
