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the richest gold ore may occur relatively close to, or far away
from, individual intrusive bodies and at various clevations or
depths. But there is nothing to suggest that the many low-grade
veins exposed naturally or in workings over a considerable
vertical range may, at greater depths or in any particular
direction, carry more gold. The character of the mineralization
changes from place to place in many deposits due to variations in
the mineralizing solutions from time to time, and changes in the
courses which they followed due to shifting of the rocks.

Secondary enrichment and deep leaching heneine low-grade
material is changed to high-grade material near the surface
probably occur in many sections. Some of the small, high-grade
copper-silver veins may be due to this. Good examples of leach-
‘ing are found on the Mount Evelyn property on the northern peak
of Hudson Bay mountain, and of enrichment on the Santa Maria
property, Howson basin.

Information, from geological studies and development
work of exceptional value to an interpretation of conditions
found in the belt as a whole, is to be found in the descriptions
of the following sections: Hazelton (Rocher Déboule and Ninemile,
etc.), Driftwood, Hudson Bay mountain, Dome mountain, Owen lake,
and the Plateaux belt at Topley.

Undeveloped sections that appear to be especially
favourable for prospecting include the mountains east of the
Skeena north of the Kispiox, Suskwa mountains, and mountains

between Rocher Débovlé and Hudson Bay mountains. There is, of

course, much scope for prospecting in all of the developed areas
where the character of deposits likely to be found is already

indicated.