Page 109 - Introduction to Mineral Exploration

92 C.J. MOON & M.K.G. WHATELEY

(e)
IV113 IV114
2420 IV2 IV49 IV115
IV27 IV1

200 m

300 m

2000
Soil
Weathered zone 400 m
Argillites
Fine-grained limestones
Marls
Dolomitic limestones
Sandy limestones
Black shale
Argillaceous sandstones
Sandy shales 600 m 600 m 600 m
Quartzites 600 m
Quartzitic sandstones
Conglomerate Zone of copper mineralisation
Basement complex

11,500E 12,000E

FIG. 5.15 (e) section through the deposit along line 18,000N shown in Fig. 5.15(a).
4 A body of potentially economic grade and processes forming economic grade mineralisa-
size has been established. tion were operative but not at a sufficient scale
5 The budget is exhausted. to produce a large deposit, at least not in the
The decision in the first case is easy, area drilled. The encouragement of high grade
although the cause of the surface or subsurface mineralisation will often result in several
anomalies that determined the siting of the phases of drilling to test all hypotheses and
drill hole should be established. The second surrounding areas to check whether the same
case is more difficult and the possibility of processes may have taken place on a larger
higher grade mineralisation should have been scale. This type of prospect is often recycled
eliminated. The presence of some interesting (i.e. sold) and investigated by several different
intersections in a prospect suggests that the companies before being abandoned or a deposit