The daily national Whig. [volume] (Washington, D.C.) 1847-1849, 1849-05-03
I From The New York Tribune.
SURVEY OF CANADA
The North Shore OF Lake Huron.

IGEOLO GICAL SURVEY OF CANADA
The North Shore OF Lake Huron.
We have received the Report Of the Proyinclu
Geologist w, =. Logan, ESD, on ihe Geological an
| Neurological formation of that portion OF CanadI
bordering on the northern shore Of Lake Huron
| This Report is but one item In the General Geoo
gcal Survey of the Province, but as the features
the Lake Huron region fully detailed, are OIL consid
ernble interest and Importance, embracing many val
| liable mining locations, we condense for The TIL
bune the following general statements:
Twenty two mining locations have been elaine,
Of the Canadian Government on the Northern shore
| of the Lake and considerable capital has been ex
pended by The various parties interested IN then
| Ia order 10 investigate the general nature oil tn
mineral ground OF the district, and ascertain fact
10 eucidare The probable productiveness OF th'
mines.
| The series OF Geological formation is TO be d
| vided into rocks Of sedimentary and gneons orl
| gin. The sedimeniaTy portion consists oil sand
stones, conglomerates, states and llmesiones.-Tht
sandstones are sometimes gray, bnl more generally
white; almost purely acions and principally me
grained, but the granular texture Is often lost, ant
great masses assuming yirnons uster present tht
character OF perfect quartz rock which, rs ionnd
both the colors mentioned; and when white IL some
times exhibits precisely the aspect Of the milky o
greasy quartz of mineralogisis the igeneons rocks
according 10 Mr.. Logan, may be Chased, asa whole
under the denomination OF Greensboro lrapi me
masses they present nre often very large
The meiallferons veins intersect all these rocks
and the varieties which are found in connection will
them. They are probably themselves intersecied
observes Mr.. Logan, by cross courses, breaking
their regular continuity; but there is no doubt taa
slips or displncements OF the country on opposite
sides Of the veins have occurred, when the fsures
Were formed which constitute this mould or recep-
tacle. Numerous instances were observed when
both granite and greensboro dykes, cut by lhe me
taierons veins, were suddenly heayed considerably
ont Of their course. This fact may be deemed val
uable as showing the probable great depth and dis
lance TO which the veins muy run. The metal whicl
tlt. vain IttI In thn fnEf
and the ores In which 1t occurs are vreons coppei
varegated copper, and copper pyrtes. Iron pyrtes
arc sometimes associated with them, but IN genera
not in large quantity. Copper pyrites were In one
and IN another by the arsenuret,ed sulphure Of iror
aud nickel containing trace Of cobalt.
| The veins vary in breadth from a few inches t.
sometimes thirty feet, but when Of this last srea
breadth, or even much less, they usually contain
considerable amount Of wall-rock From such "a
might be considered maser-lodes, innumeiab'
branches Of various sizes start, some OF which visi
| bly, diminish before proceeding lar, and dwinule Il
nothing, while others maintain moderate widths
with much regularity, for considerable distances, AMI
may run TO junction with parallel lodes.
/ Tho quantity of Copper contained IN The lodes i
very various, ranging from what might result IRON
mere specks Of ore In to The contents oil larg
workable quantities in others-but an investigation
into The average amounts is not justified either b.
the time, funds or assistance afforded in the Survey
hence but general statements are made. The Rc
i poili loWeVef, tldt III no putt W ho couhi.
visited from the vicinity OF Saul Ste Marie to She
bawenahning, any great area wholly destitute Q
cnprerous veins, and 1t would appear singular
a region extending over space OF between on
and two thousand square miles, and SO marked b.
indications, did not in the course OF time yield man.
valuable resultsn
The chief difference in the copper-hearng rocks Q
Lake Huron and Superior, observes the Reporter
seems 10 lie In the great amount OF amygdaoida ira
present among the latter and of white quartz roc
or sandstone among the former. But on the Cana
dian side OF Luke Superior there are some consider
able areas where large masses OF greensboro exis
without the anygdalod. Notwithstanding these an
some other geological differences, continues MI
Logan, there are such strong points of resemblanc
in the general mncralized condition Of the whole q
to render their equivalence highly probable II no
almost certain.
! or the twenty two mining locations claimed of tn
Government on the North shore of Lake Huron, tn
Bruce Mines" are stated 10 display collection o
mineral veins thoroughly tested than others OF
the Lakes, and 10 these, according, we gather tina
the average of the Mines Is 60l per cent, equal tn
average OF the dressed ores of CornwelL) Their
| Is abundance Of timber for mining purpose
and for fuel on the Location and vicinity; ant
the River Immediately adjoining there four fall.
| from -four TO thirteen feet each, affordng exceen
mills
Little good land, however, 10 met with along thi
part OF the Lake shore, and the front of the Bruc
Mines location is particularly rough and rocky; bn
on Saint Joseph Island. opposite there y an nmpl
extent Of excellent lind, at present well clothed witt
maple birch, and elm, In some parts and good pine
In others, and being underaid by the rocks OF the
lower fossiferous formations, 1t abounds in lime
stone nffordlng good material for either burning Of
building