CONTENTS

CHAPTER I

GENERAL CHARACTER OF THE DISTRICT............0. sees esse eee e cece cece cece 1
Introduction, page 1; Means of access, page 1; Previous geological work,
page 2; Bibliography, page 2; Acknowledgments, page 2; Physical fea-
tures, page 3.

CHAPTER II

(GUNERAT GR OLOG Yecraes core. see ee eT PTS Rape oe eet th Al ohamte anecene 5
General statement, page 5; Table of formations, page 6; Bitter Creek forma-
tion, page 6; Bear River formation, page 7; Nass formation, page 9; Age
and correlation, page 10; Augite porphyrite and allied rocks, page 12; Coast
Range intrusives, page 13; Dykes, page 15; Pleistocene and Recent deposits,
page 16; Faults, page 16.

CHAPTER III

HE CON OMI GAGE OLOGY se eey sons oersys fastener peas sacar eye osoves ayokeie tele aeieaeieps.s-e) cheleleutueiesoaneee 18
General status of mining, page 18; General character of the mineral deposits,
page 19; Veins, page 20; Replacements, page 20; Distribution and geological
features, page 21; Structural relations, page 22; Alteration of ore and country
rock, page 23; Distribution of ore in the deposits, page 23; Age of the deposits,
page 25; Future of the area, page 25.

CHAPTER IV

DHSCRIPTIONS) OF MINDIVID UAT DEPOSITS: em aceite eis clietietse eile eee erie nics lois 27
Copper-bearing deposits, page 27;  silver-lead-zine deposits, page 35; List of
mineral deposits described elsewhere, page 69.

LENDS 5 os nho-8 CUO U RS UDO LUG DOO IE OD UO Ana criae ine meatier mriocens 83
Illustrations

Map 2167. 216A. Bear River sheet (west half), Cassiar district, British Columbia.
In pocket

Map 2166. 215A. Stewart sheet (west half), Cassiar district, British Polumbia.
n pocket
Plate I. View of mount McLeod and south fork of Marmotriver............ Frontispiece
II. A. View looking northeast from mount McLeod, Marmot River valley. . 75

B. Bunkhouse of L and L Glacier Creek Mines, Limited. Glacier on
north fork of Glacier creek in background...................005 75

III. A. Scene on Prosperity group of mineral claims, 5,100 feet above sea-
eve sein 92 1e caterers ce ays ee stores Neve ver orst orate fee a eis arate se ore svetesSchalelatess 77
B. Bunkhouse of Porter Idaho Mining Company, Limited............. 77
IV. Cliff dwelling on Washington group of mineral claims.............. 79

V. A. Lowest adit and top terminal of aerial tramway, Dunwell Mines,
EPEAT LOR es eee terete atte des rosy saan nie speisticaus “atau ceyets cs stese ars aeists anus: ase 81
B. Mill of Dunwell Mines, Limited.............. 00... cece eee neces 81

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