6 COAST RANGE INTRUSIVES The contact zone of the Coast Range intrusives with the intruded Hazelton series runs in a northwest direction across Terrace area, roughly from Zymoetz river to Kitsumgallum lake and beyond. West of this line there are numerous roof pendants and several, large, isolated areas of voleanic or sedimentary rock enclosed in the granitic rocks. The more westerly of the main mass of the volcanic rocks, as on Kleanza, Bornite, and Kitsalas mountains, is intruded by granitic tongues which extend eastward from the main body of the batholith. The largest of these apophyses extends from the lower end of Kitsumgallum lake east to the Skeena in the vicinity of Pacific flag station. For many miles east of the main contact both sediments and volcanic rocks are cut by small, isolated stocks and bosses of the granitic rocks. The intrusives are dominantly granodiorite in composition, but all gradations occur from granite through granodiorite to quartz diorite and diorite and various porphyritic phases of these rocks occur. Mineral deposits are present in the batholithic rocks, but are not nearly as numerous as the deposits in the Hazelton series nor are they as rich. DYKES There are a large number and a great variety of dyke rocks throughout the area, suggesting a prolonged period of dyke intrusion following the consolidation of the batholith of Coast Range intrusives. The dykes cut both the Hazelton group rocks and the Coast Range intrusives. They are usually vertical and average from 2 to 20 feet in width. On Thornhill mountain the granodiorite country rock is cut by lamprophyre dykes. These are cut by quartz-orthoclase porphyry dykes, which are in turn cut by quartz diorite dykes. On the A claim the quartz diorite dykes are cut by hornblende porphyry dykes. A quartz-albite dyke on the St. Paul claim cuts lamprophyre dykes. A large hornblende gabbro dyke, roughly 50 feet wide, was seen half a mile south of the Eureka claim on Thornhill mountain. It exhibits a poikilitic texture, numerous small feldspar crystals being held as inclusions-in large horn- blende phenocrysts. At the Columario mine, on Kleanza mountain, aplite, quartz-albite, quartz diorite, and biotite lamprophyre dykes are common, the quartz- albite dykes being most numerous. The intrusive relations between these dykes are not discovered, but the quartz vein ore-bodies are younger than the quartz-albite dykes and presumably are younger than the other dykes. There is a 60-foot wide pegmatite dyke on the White Bluffs claims about half a mile northeast of the Zymoetz River bridge. On Maroon mountain an aplite dyke cuts across and is younger than the Bear quartz vein, and on the Black Wolf claim the same dyke is sheared, silicified, and mineralized with finely crystalline pyrite. On the Guld claim, an altered, brown-weathering dyke cuts a somewhat similar aplite dyke. The brown dykes of this type are fractured and altered and are cut by numerous, small, intersecting quartz veinlets about one inch in width. On the property of Kalum Lake Mines, Limited, on the west