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碾子沟金红石矿区地层主要为上太古界变粒岩、斜长角闪片岩及榴闪岩 ;岩浆岩主要为晋宁期基性岩 ;构造主要为断裂。矿区蚀变岩发育 ,主要为细晶直闪片岩、粗晶直闪岩、中细晶滑石岩及细晶绿泥片岩。矿体呈似纺锤状、似板状及透镜状。矿石类型有浅褐色细晶直闪石型片状矿石、灰白色粗晶直闪石型块状矿石、灰绿色或灰白色中细晶滑石型块状矿石、黑色中细晶角闪石型片状矿石及灰绿色巨晶直闪石型块状矿石等 5种。以前 3种为主 ,矿石品位一般 2 %～ 15 %。矿床规模为大型 ,矿床为变质蚀变成因。
The strata of the Nianzigou rutile mining area are mainly Upper Archean granulites, plagioclase flickrites and amphibole rocks; the magmatic rocks are mainly Jinning period basic rocks; the structures are mainly faults. Alluvial rocks in the mining area are mainly composed of fine-grained straight flakes, coarse-grained amphibolite, medium-fine graded talc and fine-grained green-mud schist. The ore body is spindle-shaped, like plate and lens. The ore types are light brown fine-grained amphibole-type flake ores, gray-white coarse-grained amphibole-type massive ores, gray-green or off-white fine-grained talc-type massive ores, black fine-grained amphibole- And gray-green giant crystal tremolite block ore five kinds. The previous three main ore grade generally 2% to 15%. The deposit size is large, and the deposit is the cause of metamorphic alteration.