Page 104 - Introduction to Mineral Exploration

5: FROM PROSPECT TO PREFEASIBILITY 87

(a)
Doris CK 10,000mE
Shear
RC Drillhole
N ● RAB Drillhole
Surface trace of
mineralisation
Potential
resource zone
5500mN

NORTHERN
GP/BP ZONE
(WEST LODE)

5000mN

EASTERN ZONE
(EAST LODE)
To King of Creation
Section 4625mN
4500mN

4000mN

SOUTHERN ZONE
(WEST LODE)

0 300 m

Doris
To Laverton
CK Shear
SECTION 4625mN
Quaternary cover DC 33 DC 34
Vacuum drill
sample horizon
WT
FIG. 5.12 (a) Typical combination of 50 m 50 m 50 m 50 m 50 m 50 m 50 m 50 m 50 m 50 m 46 m
shallow and deeper drilling over
the Doris Creek vein gold deposit 81 m
in Western Australia. The shallow 9900mE 10,000mE 10,100mE 10,200mE
(rotary air blast, RAB) drilling Basalt (minor dolerite) Black shale, argillite
defines the subcrop of the vein Granodiorite (mylonitic in part) Dolerite
whereas the deeper (reverse Qtz–Ser Sch (Sheared porphyry) Au mineralisation
circulation, RC) drilling defines
grades. (After Jeffery et al. 1991.) Ultramafic intrusive WT Water table