Secondary Occurrences of Magnetite. — Kimball. 23 
arrangement, and is occasionally found minutely laminated with, cal- 
careous matter. The most important solid stratiform mass of magnetite 
seen is about four feet in thickness. Epidote, and in some places small 
quantities of quartz, occur in association with the ore, which when the 
limestone is removed by weathering, generally forms black masses of 
pure (vesicular) magnetite." The beach is strewn with laose blocks (of 
ore) derived by this process of weathering from the limestone. "The 
contact of the limestones and volcanic rocks with the granite is close by 
to the south on the shore." 
The above observations of Dr. Dawson are thoroughly in 
accord with my own on the opposite side of the island, and 
perfectly consistent with the present explanation of such de- 
posits by replacement of limestone. 
West Bedonda Island. The Redonda islands, two in num- 
ber, are high and mountainous, culminating in lofty peaks 
from 3,000 to upwards of 5,000 feet in hight. Cut out of the 
general outline of the coast by fiords, they obviously represent 
insular or partially submerged projections of the Coast range 
of British Columbia. Touching at one point only of West 
Redonda, namely at the De Wolfe iron min6 on the north 
shore, Pryce channel, I found the formation to be identical 
with the Vancouver complex, no granite or syenite coming 
under my observation, though the former is stated by Dawson 
to be exclusively the formation of the island. The occurrence 
of magnetite was also observed to be under similar conditions 
and in similar environment to circumstances distinguishing 
occurrences of the same secondary product on the islands of 
Vancouver and Texada, 
The De Wolfe mines are at an elevation of about 600 feet 
on a steep slope rising abruptly from the water's edge 
and at an angle of some 60 degrees. During the year 
1893, magnetic iron ore, 626 tons in all, was shipped to 
the Oswego Iron and Steel Co's furnace in Oregon from two 
quarry-like workings, about 200 feet apart, in irregular mass- 
es of ore developed on separate belts of crystalline limestone, 
the terminal edges of which under a high dip to the west, are 
traced up the mountain slope as far as passable. 
The West Mine so called (Plate II, fig. 5-6) may be described 
as the altered outcrop of one division of the limestone, inter- 
posed between courses of greenstone or epidotic diorite, and cut 
off at the top by a faulted mass of less altered and highly basic 
