DOWLING. 
SUTTOX MILL LAKKS 
27 F 
flno-grainoil dark slates become thinner and the lower beds become red 
in colour. * 
At the portage the section consists of ninety feet of stratified beds 
capped by a varying thickness of tra{i. On the west side of the stream 
there is a thickness of about 150 feet. This is a dark green galdiro 
with a diabase .structure. The predominating mineral is chlorite, with 
plagincla.se, albite and quartz. Small dark almost opafpie crystals of 
ilmenite surrounded by limestone, are occasionally seen. The slates 
beneatli, to a thickness of 20 feet, are dark grayish black to greenish 
black and are thin-hi'ddcd and of fine grain. 
Near the base they resemble clay slate.s Inn. arc very hard and brit- ..Vn aii.ilyni.s 
tie, being cemented by the magnetite. An analysis of a specimen from me- 
this bed, fuinishcd by Di. HolTuiaun, gives metallic iron .'j.‘V 40 jier cent, rsHa- it- n. 
siliceous instiluble residue 48-10 per cent. The perceubige of i|uartz 
increasas downward in the section, and thin layers found at eighteen 
feet from the top are nearly all quartz, t^onie of Llic rod beds near 
the top are. somen hat crystalline in appearance, but on a polished sur- 
face the rounded grains are quite apparent. At 27 feet below the top> 
the rock consists i.s of a bright red, do.se grained jaspilyte, which in 
thin sect ion .shows well rounded grains of a hn'ghL red material, in all 
proliahility van ei’uptive, which was brokeir to a .sand and cemonted by 
quartz forming hard (juartzjto. Tlje cementing quartz i.s in a fine mosaic 
and .some of tho red grains show minute cracks and sometimes .a net- 
work of fissures which are filled by the same mo.saic. In a few of the 
grains that liave less of the colouring matter, tho material is a rraldish 
chalcodonic quartz with a dark red staining around the margin. At 
about 30 feet down in tho section, the red .sandstone.s alternate with 
dark rusty weathering coarse .slates. At 35 feet, Lfie dirk semi-crys- 
talline l)eds are enmpo.=iod mainly of small particles of quart z and magne 
tite. T’he percentage of nmgnctih^, H.s determined by Dr. IloQmann, is Perc-aitogf o f 
very high— the metallic iron content being G8-G2, the insoluble residue 
4-21 with no trace of tit.anic add. Tlii.s would make a very good ore 
but it appears to be in very thin bed-s alternating with the .sauchstones . 
As all these ores have a very high percentage of .silica, owing to tlie 
band.s of saml.stone, a reduction of this constituent might he had by 
selection or some mechanioal {irocess. From many of the berls between 
40 and 50 feet in the .section, thin inoinliors are found to be nearly 
pure maguetitc, while the thicker beds are of the dark red sandstone 
containing less of the iron ore. A talus covers the section from 50 to 
70 feet. Dark hanl beds with narrow partings of slate.s similar to the 
top lieds are found down to 80 feel. Tho lowe.st beds, or down to 90 
