Mineral Resources Potential - Geothermal Resources

wide. Propylitic dtetatibln,~ which is
tennedhk argillic alteration, surroun@
on. several &in quartz-duiaria ve~irrr
hsic alaon. The occurrences are formed of
,and granular quartz Carbonates and clay
present. The ore-mineral assemblage includes
, iron oxides, epidote, chtorite and
caldera, pyrite occurs in fractured
propylitized rhyolite, with m w mms of ptassic alteration and
development of intermediaie argillic alteration. In the fractures,
i thin veins of cavernous quartz with abundant copper sulphide
dissemination, occur. Gold content ranges hm 100 to 440 ppb.
This area appears to be the most promising among the lowsulphidation
murrences.
Auto volcano
The Aluto volcanic complex is a Quaternevy volcanic center -:
located dong the Wonji Fwult &It in the central seaor of the MER,
' -
The geology of this complex is relatively well-known from surface
mapping supplemented by data on the deep stratigraphy and I
struchue from eight deep exploratory wells that were sunk to ii
depths ranging from 1,300 to 2,500 m
$E!: .
by EGS.
L uj
According .to Govatmi and Mewet Teklemariam (1993) .*. ! ..
the oldest ~utcro~~in~ rocks in the area are found at the adjacent ; ,]eastern
rift escarpment and consist mainly of siiicic volcanic~ . ,: :.L
commonly known as the Tertiary ignimbrite unit. This unit is
overlain by a fisfltral, basaltic unit known as Bofa Basalt, which in gk . I ,. .I :.
turn is covered by sediments of lacustrine origin which also extend "-,
over large areas-of the rift floor. Th volc&c products of duto
volcanic centre itself consist of w succession qf ash-flow tuffs,
silicic tuff breccia$, silicic domes and pumice flows. These
volmic products are very young and are associated with surface
thermal manifestations that consist of hot springs and fumaroles
., I