General industrial indicators for sandstone -type uranium deposits Deposit type Boundary grade Minimum industrial grade Minimum recoverable thickness (m) Stone removal thickness (m) In-situ sandstone type uranium deposit 0.01% (square meter uranium: 1kg/m 2 ) 0.03% (square meter uranium: block 3kg/m 2 ; ore body 5kg/m 2 ) 5 (the buried depth of the deposit is <400, the occurrence is <5°) 5～7 (mineral layer (body)/non-mine thickness ratio>0.2) Note: 1 The permeability of the ore layer (body) is 0.5-20 m/d. 2 The content of 0.05mm grain size in the ore layer is less than 20%. 3 The degree of mineralization in the permeable layer is less than 5g/L. 4 The groundwater level is less than 50m. 5 pressure head is greater than 50m.
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