四、黑钨矿石英脉中砂包赋存规律与品位变化系数的推断有些石英脉中,黑钨矿经常在矿脉的某些部位大量聚集,形成各种各样的集合体。矿工们称此种集合体为砂包。砂包中 WO_3的品位一般在5—10%以上,甚至达50%,通常比矿脉的平均品位高5—10倍以上。在品位的相对变化上,砂包中 WO_3品位一般比其附近高十数倍至数百倍,甚至几千倍以上。砂包的大小不一,小者所含黑钨矿仅数十公斤,大者可达数十余吨。据徐克(井力)、丁毅所著江西南部钨矿地质志所载,砂 Inferior inclusions of quartz sand veins in Wolframite ore and the inference of grade change coefficients In some quartz veins, wolframite is often aggregated in some parts of the veins to form various aggregates. Miners called the collection sand packs. Sand grade WO_3 grade generally 5-10%, even up to 50%, usually higher than the average grade of ore veins 5-10 times above. In the relative changes in taste, WO_3 grade in the sand package is generally ten to several hundred times higher than its vicinity, or even several thousand times more. Sandbags of different sizes, small ones containing only tens of kilos of tungsten ore, the largest up to dozens of tons. According to Tsui Hark (well force), Ding Yi by the south of Jiangxi tungsten geology contained in the sand