In hand specimen the rock appears similar to quartzite beds in the schist succession,
and because of this similarity it is possible that other dyke-occurrences may have been
overlooked.

A 50-foot brown-weathering diabase dyke is exposed for a length of about 500 feet
in hydraulic workings on the Slough Creek bench in the south-east corner of Lot 10544c.
It is composed of hornblende and andesine laths and a small amount of interstitial
quartz. The dyke strikes slightly east of north and cuts across the adjoining quartzites.

A 5-foot augite basalt dyke is exposed in the bed of Nelson Creek about 600 feet
north of the crossing of the New Creek ditch. Both these dykes are massive and are
presumably related to the Jurassic, Mount Murray intrusives.

19