الفهرس 
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Abstract
Cu - N,i-sulphide llineraU.zation ~5sociat.ed witb ulttramafic-metfic r cks belonging to tie Precembri<:n Casement complex is recently diBcovered in El-Genena El~Gbarbia
(Let i tude 23° 53’ N bod longitude 34° 35 r E) East:er 13 ’
Desert, Egypt.
Tbe ar{” c:, h” (.over~d mt in 1.1 by 1 tral asic-basic rocks comprising serpentinite, se~pentin’zed perid0tite, pyroxenite, met gc.bbrc ’;j’1d y ):Jt”Jger ~A’ bro t”ge ther with met Bsediment ary and metavo Ie 8. ,ic roc ks.
’Tbe ore is disseminated Clnd is m inly restricted to the serpentinized peridotite loeat.~d in ~he north 1e88tern pc.rt of tbe are a.
It is mainly fO~fficd of pyrrbotite, chalcopyrite, pentlaadite and cubanite whicb constitute tbe main primary sUl~bide minerals. Pyrite . d b”’lrnite Bre also
present as ’ninor eonstitu(’}ots par:,icul in tbe basic
rocks.
The pyrrhotite is the mcjor c,)n;:,titueot of the sul:9bide minerals e:.nd seams nearly 2/3 of ”h total sulphide fracctioD. Cbalcopyrite is the spcond ~buudand mineral while