Type of deposit and Principal Minerals G4 stage G3 stage G2 stage G1 stage Remarks “III. Rare metal and REE occurring in pegmatites, reefs and veins/ pipes.
Scout drilling/ random pitting/ trenching as per necessity 10 to 25 pits/ trenches per sq.km.
In case of drilling, borehole spacing may be 40m x 20m or 40m x 40m.
Pitting/Trenching/ preferably at 20m interval.
In case of drilling, borehole spacing may be 20m x 10m or 20m x 20m.
Exploratory open pit or boreholes at 10m x 10m or closer or underground sampling with bulk determination of grades and recovery wherever necessary.
IIIA. Rare metal and REE occurring in carbonatite and other alkali igneous rocks
(i) Tabular Rare metal and REE deposits
(ii) Lenticular Rare metal and REE deposits in the form of veins / lenses Scout drilling/ random pitting/ trenching as per necessity Scout drilling/ random pitting/ trenching as per necessity Borehole grid/ sample spacing may be 400m x 200m or closer Borehole grid/ sample spacing may be 200m x 200m or closer Borehole grid/ sample spacing may be 200m x 100m or closer Borehole grid/ sample spacing may be 100m x 100m or closer Borehole grid/ sample spacing may be 100m x 100m or closer Borehole grid/ sample spacing may be 100m x 50m or closer.”.
[F. No. 16/62/2020-M.VI] Dr. VEENA KUMARI DERMAL, Jt. Secy.
Note:- The principal rules were published in the Gazette of India, Extraordinary, Part II, section 3, sub-section (i) vide number G.S.R. 677(E), dated the 11th July, 2016 and lastly amended vide number G.S.R. 134(E), dated the 20 th February, 2019.
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2023-09-23T16:09:16+0530 AMIT KUMAR JAISWAL