At two Grams Platinum in 1999 tests and .20 a Gram Gold in 1999 test, we are Many Fold Larger now: in GOLD but smaller in Platinum divide by 6 on the high numbers, so: ? :
NR Yesterday TOP half..//..""...Original Replicate Type Description Length
Sample Sample
-----------------------------------------------------------------------
BJ98-008 AGBM-1R Channel Altered limestone 1.50
BJ98-009 AGBM-2R Channel Altered limestone 1.30
-----------------------------------------------------------------------
The two channel samples were sent to Loring where they were crushed
and pulverized to -100 mesh, then returned to APEX under secure
chain-of-custody. The rock grab sample was sent directly to APEX in Edmonton
where it remains under secure storage.
Precious Metal Analyses of Surface Bulk Samples
Lakefield Research Limited: The chain-of-custody surface samples collected by
Strathcona were analyzed for gold by routine lead collector fire assay by
Lakefield. Gold was not detected in any sample. Lakefield is an ISO/IEC Guide 25
accredited analytical laboratory.
Activation Laboratories Ltd. Birch Mountain requested that Strathcona submit
chain-of-custody samples SMSBM-4 and SMSBM-9 for precious metals analyses by a
number of different analytical methods. The analyses were done by Actlabs, an
ISO/IEC Guide 25 and CAN-P-1579 accredited analytical laboratory. Methods used
included enhanced neutron activation (method code 1D - INAAGEO.REV1), aqua regia
digestion - graphite furnace atomic absorption (method code 1A8), nickel
sulphide fire assay with neutron activation (method code 1B - INAAGEO.REV1) and
ICP-MS (method code 1B2) analyses, and lead fire assay with ICP-MS analysis
(method code 1C-RES). The results of the above methods showed that the
concentrations of precious metal assayed (Au, Pt, Pd, Rh, Ru, Ir, Os and Re),
were all less than 1 ppb, except for gold in SMSBM-4 at 2 ppb by lead fire assay
and osmium at less than 2 ppb.
GEO LABS: Chain-of-custody samples SMSBM-4 and SMSBM-9, which replicate Birch
Mountain bulk samples BJ98-008 and HAR98-002 respectively, were analyzed in
duplicate by GEO LABS using a multi-acid closed beaker digestion (method code
CT4) followed by ICP-MS (inductively coupled plasma - mass spectrometer)
analysis (method code IAT-200) of the digest solutions. The precious metal
results from GEO LAB are reproduced below (the suffix "D" denotes duplicate):
Sample Replicates Au (ppm) Pt (ppm) Ag (ppm)
Birch Sample
------------------------------------------------------------------------
SMSBM-4 BJ98-008 0.045 0.355 less than 2.5
SMSBM-4D BJ98-008 less than 0.025 0.04 less than 2.5
SMSBM-9 HAR98-002 less than 0.025 0.045 less than 2.5
SMSBM-9D HAR98-002 less than 0.025 0.025 less than 2.5
Detection limit 0.025 0.01 2.5
------------------------------------------------------------------------
With respect to these results, GEO LABS stated:
"The results of the complete digestion of the two BMR samples indicates
that, with the exception of one of the two analyses of SMSBM-4, they
have very low precious metal contents (Ag, Pt, Au) that approach or are
below the lower limits of detection for this technique. Whereas the
strong contrast in the values obtained for SMSBM-4 might indicate the
presence of precious metals heterogeneously distributed within the
sample which could be leached by a suitable technique, further, more
detailed analyses, would be required to confirm this."
Birch Mountain requested that GEO LABS process an additional six samples
using the same analytical method used above. GEO LABS stated that it was unable
to quantitatively determine the precious metals concentrations in the samples
provided by Birch Mountain due to interferences from certain elements during
analysis by ICP-MS. GEO LABS wrote:
"Owing to the efficient separation of the PGE from the sample matrix at
the fire assay stage, the amount of the interfering element is normally
relatively low during analysis. However, in the solutions prepared by
the mixed acid digestion technique, the interferences (in particular
from Zr, Hf, Ta, and W, Table 2) (x) were found to represent a
significant proportion of the intensities of the precious metals, which
also appeared to be present at very low concentrations in the samples.
Owing to the magnitude of the contribution of the interferences to the
intensity of the signal for each of the precious metals, it was not
possible to obtain meaningful or consistent results for either the
samples submitted for analysis, or the two standard reference materials
and method blank included with the samples (Table 3) (x). As a
consequence, no data are reported for the samples at this time."
(x) Tables 2 and 3 referred to in this quotation do not contain
information related to the precious metals concentrations in the sample and are
not included in this news release.
Birch Mountain believes that the cautions expressed by GEO LABS with respect
to the results for the second suite of samples apply equally to the first.
CanTech Laboratories, Inc. Mr. Martin Thomas, M.Sc., P.Eng. of Lateral
Solutions Inc., Calgary, Alberta, initiated a series of tests by CanTech
Laboratories, Inc. ("CanTech"), Calgary, Alberta, using an analytical method for
the determination silica-encapsulated gold. CanTech is not an ISO registered
analytical laboratory. The method used is published by the Society of Mineral
Analysts (U.S.) in their publication entitled, "Amenability of Gold Ores and
Process Solids to Cyanide Leaching". The method uses multiple aqua regia digests
to decompose a 2.0 g sample, followed by sodium peroxide fusion and aqua regia
digestion of the insoluble residue. A solvent extraction procedure is used to
extract gold from the aqua regia digest solutions and gold and silver are
measured by atomic absorption.
The samples used in the test were surface bulk samples that were either
sampled by Birch Mountain or by APEX as part of the 2001 chain-of-custody
surface sampling program. The certificate of analysis received from CanTech for
the silica-encapsulated gold method gave the following results:
Original Replicate Chain-of- Gold Silver
Sample Sample Custody (ppm) (ppm)
-----------------------------------------------------------------------
BJ98-008 AGBM-1R Yes less than 0.01 0.8
HAR98-008 No less than 0.01 3.5
BJ98-009 AGBM-2R Yes 0.43 1.0
BJ98-009 No 0.34 1.9
-----------------------------------------------------------------------
CanTech also conducted fire assays for gold using a sample size of 15
g and routine multi-acid digestion-atomic absorption analysis for silver using a
sample size of 0.5 g. The CanTech certificate of analysis gave the following
values for gold and silver:
Original Replicate Chain-of- Gold Silver
Sample Sample Custody (ppm) (ppm)
-----------------------------------------------------------------------
BJ98-008 AGBM-1R Yes less than 0.02 0.4
HAR98-008 No less than 0.02 0.8
BJ98-009 AGBM-2R Yes 0.02 0.4
BJ98-009 No less than 0.02 0.4
-----------------------------------------------------------------------
In summary, the results for gold from the silica-encapsulated gold
method for Birch Mountain bulk sample BJ98-009 and its chain-of-custody
equivalent, AGBM-2R, conflict with the results for these two samples by
conventional fire assay.
Drill Programs
--------------
Chain of Custody Drilling, 2000
In February and March 2000, Birch Mountain drilled two holes which twinned
holes previously drilled by companies exploring for precious metals on the
Company's Athabasca mineral property. By way of background, analytical electron
imaging by Lac North America Ltd. ("Lac") in 1994 had identified several
intervals in cores drilled by Lac and Tintina Mines Limited ("Tintina") that
contained elevated precious metal microparticle counts. BM00-1 twinned Lac drill
hole ATH 94-01 and was drilled to a depth of 299.51 m, terminating in
Precambrian age granitoid gneiss. BM00-2 twinned Tintina drill hole T2 and was
drilled to a depth of 155.59 m, terminating in Devonian age evaporites of the
Ft. Vermilion Formation.
Three intervals from BM00-1 and one interval from BM00-2 were sampled under
chain-of-custody by Doug Dumka, B.Sc., of Strathcona. Mr. Dumka was present at
the drill site and took possession of the core from these selected intervals as
it was recovered from the drill hole. He then personally supervised the cutting
and sampling of core from the selected intervals, keeping one-quarter of the
core under secure chain-of-custody and returning the other three-quarters to
Birch Mountain. One-quarter of each of the three core intervals remains in the
possession of Strathcona. A document received from Dr. von Guttenverg of
Strathcona describing the 2000 chain-of-custody core sampling program is
available for examination at the Company's Calgary office during normal business
hours.
Birch Mountain has examined a limited number of samples from its own portion
of the core from BM00-1 and -2 using an environmental SEM ("ESEM"). Normal SEM
requires that a conductive coating be applied to the sample. The ESEM permits
the examination of uncoated samples. The Company's observations show that
precious and non-precious metal microparticles are detectable by ESEM within
some of the intervals identified by Lac as containing precious metals by
analytical electron imaging. No geochemical analyses or assays of this core have
been done to date and none are planned until the Company is confident that it
possesses an alternative method to determine the precious metal concentrations
in rocks from its Athabasca property.
Chain-of-Custody Drilling, 2001
A chain-of-custody drilling program consisting of one hole drilled to a depth
of 139.9 m was conducted on July 10-23, 2001, under the supervision of Mr. Dean
Besserer, B.Sc., P.Geol. and Mr. Craig Scherba, B.Sc. of APEX. Drill hole BM01-1
was located approximately 2.5 m north of the Birch Mountain drill hole BM98-04
and 3 m northwest of Syncrude Canada Ltd. drill hole 11-07-AE-96-10W4. Drill
core was recovered from 65 m below surface to the bottom of the hole. A document
received from APEX describing the 2001 chain-of-custody drill program is
available for examination at the Company's Calgary office during normal business
hours.
All core was transported, frozen, cut, logged and sampled in 1 m intervals by
APEX; 150 samples (75 samples, in duplicate) were collected from drill hole
BM01-01. Samples were bagged and secured in pails with security seals. All
samples were under the control or supervision of APEX at all times. One complete
set of samples was sent directly from the field to APEX, where they remain. The
duplicate set of samples was sent to Loring, crushed and pulverized to -100 mesh
and then returned to APEX under secure chain-of- custody, where they remain.
Birch Mountain has not yet examined this core. A limited number of chain-
of-custody samples from this core have been provided by APEX to independent
consultants for use in on-going geochemical testing programs.
Oil Sands Delineation Cores, 2001
In the past, Birch Mountain has examined nearly 400 oil sands delineation
drill cores and over 600 geophysical drill hole logs obtained from oil sands
companies. The oil sands delineation holes are drilled 3-15 m into the Devonian
age limestone that underlies the oil sands and it is this core interval that is
obtained. This information is non-specific to the Company's exploration, but is
useful for mapping alteration patterns and structures. In 2001, 292 oil sands
delineation drill cores from Syncrude Canada Ltd.'s Aurora Mine, Suncor Energy
Inc.'s Steepbank and Millennium mines, and Albian Sands Energy Inc.'s Muskeg
River Mine were examined and sampled. In 2001, 139 geophysical logs from Suncor
Energy Inc.'s Steepbank and Millennium mines were examined.
The cores were quartered with a dry-cut diamond saw, logged and sampled on 1
metre intervals at Birch Mountain's Calgary core logging facility. Samples
comprising one-quarter of the original core were shipped to Bondar Clegg, North
Vancouver, B.C., for preparation and multi-element geochemical analysis. Samples
representing the remaining one-quarter of each core are archived in Birch
Mountain's secure storage facility in Calgary, as are all sample pulps and
rejects.
Precious Metals Analyses of Drill Core
Oil Sands Delineation Core Samples: Some 51 samples determined to be altered
were selected for Au, Pt, and Pd determination by lead fire assay by by Bondar
Clegg, North Vancouver, B.C. (method code FA36). Bondar Clegg is an ISO 9002
registered analytical laboratory. These samples were chosen to see if they would
respond to conventional fire assay; they did not. All values were close to or
less than the lower limit of detection of the method.
Drill Holes BM98-4 and Chain-of-Custody BM01-1: Birch Mountain drill holes
BM98-4 (news release of March 11, 1999) and BM01-1 were drilled to twin Syncrude
drill hole 11-7-AE-96-10W4 which contained fire assayable platinum and gold over
a 1.6 m interval in Devonian age limestone immediately below Cretaceous age oil
sands (news release of April 3, 1997). In a news release on June 24, 1999, Birch
Mountain stated that conventional fire assay of core from drill hole BM98-4 did
not detect anomalous precious metals. Hole BM01-1 was drilled by APEX under
chain-of-custody. One sample from each of these drill holes was provided to
Lateral Solutions Inc. for analysis by CanTech using the same
silica-encapsulated gold an fire assay methods discussed above. Details of the
samples used are as follows:
Sample ID Drill hole Depth Depth to Thickness Chain of
from (m) (m) (m) Custody
-------------------------------------------------------------------------
3402 BM98-4 72.40 73.50 1.10 No
01CSB 308 BM01-1 73.0 74.0 1.0 Yes
-------------------------------------------------------------------------
Birch Mountain sample 3402 replicates the upper 1.1 m of the 1.6 m
interval in the original Syncrude drill hole. Sample 01CSB 308 replicates the
lower 0.79 m of the 1.6 m interval in the original Syncrude drill hole, and
includes a 0.21 m interval beneath the bottom of the original sample. CanTech
reported the following results by the silica-encapsulated gold method:
Sample Gold (ppm) Silver (ppm)
---------------------------------------------------------
3402 4.73 8.0
3402D less than 0.01 6.1
01CSB 308 less than 0.01 less than 0.01
01CSB 308D less than 0.01 less than 0.01
01CSB 308D less than 0.01 less than 0.01
---------------------------------------------------------
CanTech reported the following values by conventional fire assay
determination of gold (15.0 g sample) and 4 acid digest - atomic absorption
analysis of silver:
Sample Gold (ppm) Silver (ppm)
---------------------------------------------------------
3402 less than 0.02 0.8
01CSB 308 0.04 0.4
---------------------------------------------------------
In summary, conflicting results have been obtained for both gold and
silver, both between duplicate analyses of sample 3402 from drill hole BM98-4
using the silica-encapsulated gold method and between the results of this method
and conventional fire assay and multi-acid digest results for gold and silver,
respectively. The disagreement between sample 3402 and chain-of- custody sample
01CSB 308 may signify that the gold and silver detected in sample 3402 originate
from the upper part of the interval sampled; the upper part of this interval was
not included in the interval sampled in 01CSB 308.
Birch Mountains Mineral Property, Alberta
At December 31, 2001, the Company's ..//..""
REFERANCE 1999 post below::
To:Chuca Marsh who wrote (272)
From: Chuca Marsh Wednesday, Nov 3, 1999 9:43 AM
Respond to of 367
Search Carlin, soon, lowtemeratureendmember PHRASE:http://www.birchmountain.com/html/mineralization.html
".. In Alberta, our geologists have identified anomalous precious metal enrichment, alteration and structures essential to the Prairie Gold model. We now consider that the gold and platinum observed in Athabasca, Alberta is representative of a low temperature end-member of sediment-hosted precious metal deposits such as the Carlin gold mine in Nevada. .." ..//..
((So is End Member Significant? ROFLMA...Ooops - End Member Off! ))..//.. ".. On April 3, 1997 we announced independent fire assays confirming gold and platinum on our Athabasca property in northeastern Alberta. Bondar CleggBondar CleggActivation LabsGold (grams/tonne)Platinum (grams/tonne)0.204.940.192.210.212.21
Significant progress has been made towards the discovery of a potential sediment-hosted gold-platinum deposit on Birch Mountain's Athabasca property in northeastern Alberta. Over the past year, Birch Mountain has concluded that the Prairie Gold model, probably represents a low temperature variant of certain uncomformity-related, sediment-hosted gold deposits in Nevada that are not associated with intrusive or volcanic heat sources. This recognition has primarily been driven by our detailed examination of cores obtained from oil sands operator Syncrude Canada Ltd. and structural mapping using core-based information combined with results of our 1997 23,000 line kilometer high resolution aeromag survey. .."
SEARCH:
search.go2net.com.
Results for "carlin gold mine" 1 to 16 of 16 results
View by: Relevance | Site | Source
Email results to a friend Anthony R. Adkins, Professional Geologist Serving the Metal Mining Industry - Highlights ...Infoseek: Professional Qualifications as a Consulting Minerals Geologist
Lycos: Anthony R. Adkins, P. Geol . Consulting Minerals Geologist Metal Exploration, Development, and Production Fieldwork to P
1000, wic.net (Infoseek, Lycos)
..//.. ".. Carlin Gold Mining Co., (currently Newmont Gold Co.), Elko, NV. My duties included: pit and field mapping, drill programs, and the early evaluation of the Gold Quarry deposit. I Identified, from surface mapping, the potential of the Lantern deposit area (approx. 500,000 ounces of gold) and recommended it for further development. Jun 81 to Apr 84 ..//.. " Canadian Mining Hall of Fame - Mervyn Arthur UphamMervyn Arthur Upham 1917 - The fist of mines in which Mervyn Arthur Upham played a significant role developing is consid
625, halloffame.mining.ca (Lycos)
..".. // .." ..From 1960 to 1964, as vice-president and general manager for International Minerals & Chemical, he solved the puzzle of extracting Saskatchewan's huge potash deposits. To get to the potash deposits, a shaft had to be sunk through the Blairmore formation of rocks. The Blairmores are saturated with water under great pressure and had defeated all earlier attempts to sink mine shafts. Upham succeeded by freezing the ground while sinking the shaft and installing cast iron lining to prevent water inflow after the shaft was completed.As vice-president,of mining operations for Newmont Mining from 1964 to 1969, he participated in the startup of the Carlin gold mine in Nevada and development of the Granduc mine in northern British Columbia. He took over as president at Granduc after 26 men were killed in an avalanche attempting to develop the mine in the rugged terrain. Upham directed construction of an 11.6-mile tunnel under three mountains and three glaciers to reach the orebody - at the time the longest tunnel ever driven from a single entry
..//.. "..
Chucka
FROM
Message 11792413 |
