南非某锰矿床地质勘查设计设想

Design Assumption on Geological Exploration of a Manganese Ore Deposit in South Africa

南非某锰矿床深400～1 500 m,二层平行的矿体厚分别为3.59 m和5.90 m,南非某资源公司原选择了东部一块面积为19 km2的矿床进行勘探设计,但其设计钻探网度达不到其目的要求,钻探计划中钻孔深度西南部太深,西北部太浅,探矿设计与采矿分离。根据矿山开采的需要,本次勘探设想沿矿体走向扩大了探矿范围和加密了探矿网度,增加勘查资源量1 100万t,可满足融资可研的需要。由于钻孔太深,为节省投资、缩短建矿时间,同时提出采用开拓竖井和坑内平巷作为探矿进路,采用坑内钻孔或天井、地井进行加密探矿,求得探明资源量,以满足矿山开发的需要。

Depth of a manganese ore deposit in South Africa is 400~1500m,thicknesses of two paralleled ore bodies are 3.59m and 5.90m respectively,an ore deposit with area of 19km2 located in the east is selected by a resource company of South Africa for exploration design,but density of design drilling grid can not meet the objective and demands,in drilling design,depth of drilling is too deep in the south-west and too shallow in the north-west,ore prospecting and mining are separate.According to requirement of mining,scope of ore prospecting is enlarged and density of prospecting grid is increased,amount of resource exploration of 11000kt is added,which can meet the requirement of financing and feasibility study.Because drilling hole is too deep,in order to save the investment,shorten the time of mine construction,it is suggested that exploration silo and tunnel level are used as prospecting access and drilling hole or raise and ground well are used for increasing prospecting,which can meet the requirement of mine development.