The Wallace miner. [volume] (Wallace, Idaho) 1907-current, 1923-04-05

natter ueptu DeluS attained pA a lOCd
firm, Diamond Drill Contracting com
pany.
The first volume of transactions, a
1. NJ. +, 1S71-1S7S. reports a hole TO-
feet deep, whereas in 1909 the Ger
man government drilled a hole 7S47
feet (224O meters) deep. The COM
pany with which l am connected has
record of drilling 1900 feet in one
hole in 1914 days or 80 shifts. We
also have one-day record of 100 feet
Other drillers have made better speeu
One machine working two shifts daily
should make a record of 1000 feet per
month ordinarily
! Diamond Drilling in Occur d'Alenes.
Contrary to general belief. in the
Occur d'Alene district some of the
earliest pioneer development of ore
bodies which afterward proved pro-
ductive was by diamond drilling. One
particular instance exposing a vast
body of galena ore extending the life
of the mine and making future big
mine financing easy. An instance of
consistent prospecting by this meth
cd is that of one company which has
done continuous drilling for 20 years,
keeping some 20 million tons of de-
veloped ore in reserve during the en-
tire period, except during war time.
since when the reserve has been re-
stored Primarily this work was done
to determine character, size and con-
tent of ore bodies and to determine
treatment method and suitable ca
pacity of ore treatment plant; also to
lay out plans for both immediate and
future mining. which have been fol-
lowed as carefully as the architects
plans of a skyscraper are followed
There has been no deviation from the
plans nor cessation of work and the
mine has dividend record of over
10000 900. The saving in possible
dead work alone in such a vast mine
able tonnage has more than justified |
and paid all expenses of drilling; al
so, 1 claim if 20 million tons of ore |
was held in reserve by any other |
known method, the interest on the |
cost to develop such a tonnage would /
pay for all diamond drilling necessary |
10 develop the same tonnage, thereby |
permitting the company to use the |
until the ore is actually |
wanted and thereafter be guided in
manner at a time when financial re-
urns from the ore are enriching the !
treasury.
Other Advantages of the Diamond.
In the sampling and estimation of
Onnage and value, core and sludge
amples can be relied upon within
cry close limits if care is exercised,
md if these are combined in proper
ion to volume. accuracy is increased;
nut after closely checking both, one
has discarded the core US
ng only the sludge for assay purposes.
FOR further information on this sub
ect you are referred to a paper on
Sampling and Estimating Dissemin-
ted Copper Deposits" by Ira B. Jor-
lemon. which was presented at the
february 1922, meeting of the A. l.
4. & NJ. E.
Employment of the core drill to
raw off chambered underground wa
ers is found to be the safest means
5here life may be endangered or the
jumps are liable to flooding. Per
APPS had the drill been used as a fac
Or of safety in the Alaska Treadweli
line it might be in operation today
discovery of parallel veins and ore
boots may be exposed and finally
lined instead of being left to acct
entail discovery as in the case of the !
Western Union and Hecla mines in 7
he Occur dAlenes. After a cOmpre- /
ensve campaign of diamond drilling !
nd it is decided to put the property
Ito production, the ore treatment and
ne mine works can be in progress
and both be ready at
randy and Copper Mountain, b. c.
or estimating developed tonnage, to
etermine the character of founda-
Ons and several other uses, nothing
ompares favorably with the core
rill when costs and accuracy are \
)nsidered. tc
Notable Examples. Y
There are cases even in our terri
Try where mines have been resusci-
tied and made productive after pre- 3
ous abandonment or barren opera
on, as the Cleveland mine, Stevens I
)unty, Wash. To the common OBJ
ction that the drill hole is so small
lat it may miss the ore shoot, we
IN point out the many mine work I
gs which have met similar results,
} shown by maps in your offices and
inc. The Premier mine, Portland 7
anal, was one of these; Homestead A
on Dyke, Oregon, and others which =,
)u and 1 know. At the Rebecca
inc, Ferry county, this state, where
considerable body of ore had been
sveloped, the management decided L
equip the mine and develop it ex- +
They first employed a dia- t
op1 drill moo c,,ro Of GO fafxr I n