Page 205 - Introduction to Mineral Exploration
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188 C.J. MOON & M.K.G. WHATELEY
published geological mapping (Ussher 1912). lithological number and lithological name in
The most important component is the distribu- the key (Fig. 9.4, Tables 9.3 & 9.4). In contrast
tion of lithologies that were outlined by gener- to conventional maps it is easy to select indi-
ating polygons. Each polygon has a unique vidual units; in this case (Fig. 9.5) the acid and
number which is linked in a table to the basic volcanics have been chosen.
55,000
50,000
45,000
5
N km
250,000 255,000 260,000 265,000 270,000 275,000 280,000
FIG. 9.4 Geological map of Fig. 9.3 showing polygon numbers.
55,000
50,000
45,000
250,000 255,000 260,000 265,000 270,000 275,000 280,000
Legend
10 Prospect
km
River
Volcanics
FIG. 9.5 Geological map with only acid and basic volcanics selected. Compare this map with Fig. 9.3.
