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箇舊鑛區的金屬鑛床是不規則的管狀、扁豆狀或巢状的鑛体,厚度為3～5公尺甚至25公尺或更大,走向長50～100公尺。鑛体主要埋藏於石炭岩中,在个别情况下也埋藏於石灰岩与花崗岩的接觸帶中。石灰岩穩固,但大部分有裂縫。氧化鑛鬆软不穩固,通常可以用十字鎬或風鎬進行採掘。鑛体的傾斜為20°～45°。根據这些條件,各鑛山採用了方框充填法。这种採鑛方法的最大缺點是: 一、採鑛成本極高; 二、木料消耗比其他採鑛方法多; 三、由於架欀、採掘和充填料運搬等工作的繁重,故勞
箇 The metal deposits in the old mining area are irregular tubular, lenticular or nepheline ore bodies with a thickness of 3 to 5 meters or even 25 meters or more and a length of 50 to 100 meters. The ore body is mainly buried in the carbonaceous rocks, and in some cases also buried in the contact zone between the limestone and the granite. Limestone solid, but most of the cracks. Oxidized ore loose soft, usually with a pickaxe or picks mining. Ore body tilt of 20 ° ~ 45 °. According to these conditions, the mines use a box filling method. The biggest drawbacks of this mining method are: First, the cost of mining is extremely high; Second, the consumption of lumber is more than that of other mining methods; Third, due to the heavy workload of cradle, excavation and filling material transport,