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长坡层面脉型矿体是大厂矿田罕见的特富矿体,是本矿区锡石—硫化物矿床的重要类型之一。这类矿体有75、77、16、80、81号等,它们均位于长坡倒转背斜两翼两种不同岩性的接触面上,其中以75、77号规模和储量最大。该两矿体产于倒转背斜两翼上泥盆统小扁豆灰岩与细条带灰岩、细条带灰岩与宽条带灰岩的接触面上。在平缓东翼的构造有利部位形成的矿体,具有“特富矿体和暴风式品位”之称,其品位之高,厚度之大,堪称矿区之最,储量亦居大脉状矿体之首。
Changpian vein-type orebody is a rare Tefunite orebody in Dachang orefield and is one of the important types of cassiterite-sulfide deposits in this ore district. Such ore bodies are No. 75, No. 77, No. 16, No. 80, and No. 81. They are located on the contact surface of two different lithologies of the two sides of the anticlinal anticline in the long slope, of which No. 75 and No. 77 have the largest scale and the largest reserves. The two ore bodies are produced on the contact surface of the upper Devonian lenticular limestone and fine-band limestone, fine-band limestone and broad-band limestone in the reverse anticlinal wings. The ore body formed in favorable structural parts of the gentle east wing has the characteristics of “Te Fu ore body and storm style grade”. Its high grade and large thickness are the most important in the mining area with the reserves of large vein-shaped ore body First of all.