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fect. The areca is largely underlain by massive dosegsie volcanics,

but in places there are some of the bedded formations. Those rocks

are cut in places by granitic intrusives, mainly in the form of

dykes. These are very abundant on Grouse mountain and Mineral hill,

which together constitute the most outstanding physical feature of

the area and which so far have proved to be the most highly

mineralized. The intrusives hore are clearly indicated to be of

different types and different ages, but they may be related.
Mineral deposits have been discovered throughout the

area, most abundantly in readily accessible sections and least so

in the more remote parts. The chief metals present, though not

all three occur in all deposits, are copper (in chalcopyrite),

zine (in sphalerite), and lead (in galena). Silver assays are

low (15 ounces to the ton or less), though in rare, very small

veins carrying much tetrahedrite, on Grouse mountain and on

Mineral hill, they are high (about 150 ounces). The amount of

gold is in most cases unimportant, though rare good or high

assays have been secured on Grouse mountain. Pyrite is usually

abundant and in a number of places, widely separated, hematite

and magnetite are also abundant. :
The deposits are small, without much regularity or

continuity. Development has been disappointing: good showings

at the surface in places were found not to continue to cepth and

surface work failed to show continuity. The very rich deposits

are mostly measured in inches, deposits of fair grade are wider,

and of poor grade still wider. However, given high base metal pee

prices the small deposits indicated might be worked profitably, g

}

especially where there are a number in a limited area near
transportation. More favourable conditions than have been
demonstrated by development work may have caused the formation
of larger concentrations. Although valuable gold deposits have

not been discovered up to date the position between Dome mountain