沉积型一水硬铝石型铝土矿床勘查评价中几个问题的探讨——以黔北铝土矿床为例

On Some Problems of Exploration Evaluation of the Sedimentary Type Diasporic Bauxite Deposits:Examples from the Bauxite Deposits in Northern Guizhou

以黔北铝土矿为例,对沉积型一水硬铝石型铝土矿勘查评价中的4个问题进行讨论,并提出:(1)将勘查类型按普查、详查、勘探阶段分别用初定、暂定、确定来进行定性;(2)用"菱形孔"而非"矩形孔"的布置方法来解决勘查类型的变更与工程控制间距非整倍数的问题;(3)"地表工程间距加密一倍"的适用范围是:露采且处于"剥蚀区"内的矿体。地表露头线呈线状展布且上覆有岩层或虽也强风化,但仍保存原岩层层理迹象的范围,则可与勘查类型和勘查阶段同距同网;(4)普查、详查阶段中工程矿体边界A/S的取值可在1.8～2.6之间,以保证块段矿体中的A/S值达到工业要求即可。

This paper discusses four problems encountered in exploration evaluation of the sedimentary type diasporic bauxite deposits, taking the bauxite deposits in northern Guizhou as examples. We suggest that ： （ 1 ） The exploration types should include initial, provisional and final determinations corresponding to the survey, detailed survey and exploration stages, respectively. （2） ＂Diamond holes＂ rather than ＂rectangular holes＂ are used to solve the non integral muhiple problem of changing exploration types and engineering control spacing. （ 3 ） The applicable scope of ＂surface engineering spacing encryption a time＂ is open mining and ore bodies in the ＂denuded zone＂. In the areas where surface outcrop lines are linearly distributed and there are o-verlying rocks or the rocks have been weathered strongly, but the original rock bedding is still preserved, the same exploration type and exploration stage can be assigned by the same network and same distance. （4） During the general and detail survey stages, the A/S values of engineering ore body boundary can be taken as 1.8 - 2.6 to ensure that the A/S values of lump-segment ore bodies meet industrial requirements.