We're coming around slowly
Yamba Lake caustic dissolution evaluation of samples
Tanqueray Resources Ltd TQY
Shares issued 21,536,111 May 21 close $0.45
Thu 22 May 97 News Release
See Cypango Ventures Ltd (CAV) News Release
Mr William Friesen reports
Results have been received from the caustic dissolution evaluation of a
series of sample batches taken from the T-10 kimberlite pipe, discovered
recently in the central portion of the Yamba Lake property in the Northwest
Territories. The Yamba Lake property is 320km northeast of Yellowknife and
adjoins the property upon which BHP/Dia Met's advanced Koala project is
located.
>From this sample of 83.6 kg of kimberlite, six macrodiamonds (greater than
0.5 mm in the longest dimension) and 62 microdiamonds (smaller than 0.5 mm
in the longest dimension) were recovered.
The sample was processed in ten batches deemed to be representative of the
multiple phases of the kimberlite pipe. These batches were taken at various
intervals from core extracted from a single hole which was drilled at an
angle across the pipe. The caustic dissolution method of evaluation
immerses the kimberlite core into highly alkaline sodium hydroxide at high
temperature in order to dissolve the kimberlite. Diamonds survive this
process of dissolution as a result of their low susceptibility to acidic or
basic attack. After the kimberlite is dissolved, any diamonds that were
contained therein are recovered from the remaining few grams of residue.
Sample batches each contain a quality control synthetic spike to verify
recovery efficiency and the lack of any process-induced damage to natural
diamonds in the sample. These diamonds are hand sorted and measured in a
secure diamond sorting laboratory. This process is capable of extracting
even the smallest of diamonds (>125 microns in length).
The T-10 kimberlite pipe appears to be a small diatreme and consists of at
least four separate phases, each one representing a different intrusive
event. From a 5 kg sample that was representative of one phase of the pipe,
three macrodiamonds and 36 microdiamonds were extracted. This represents
more than half of the diamonds extracted from the 83.6 kilogram sample and
provides evidence of intrusions in the area that have well sampled the
diamond stability field. As a result of the many phases throughout a
relatively small diatreme, it is considered that the T-10 kimberlite pipe
has a high probability of being a satellite pipe to a larger pipe in the
vicinity. Sampling and surveying to establish further drill targets in the
immediate vicinity of the T-10 pipe is continuing.
Cypango is presently drilling a series of four targets referred to as the
Gooseneck targets. These targets lie adjacent to a peninsula that extends
west from an island in a lake in the central portion of the property. The
targets are defined by a kimberlitic pyrope garnet, chrome spinel, and
olivine-rich indicator mineral dispersion train that terminates beneath the
lake. Microprobe analysis of indicator minerals from this train shows that
the grains originated from kimberlites that have sampled the diamond
stability field and broadly confirm favourable conditions for the presence
of diamonds. The targets appear as a series of well-defined magnetic lows
on the ground magnetic survey and the profiles appear to be consistent with
those of kimberlite pipes that have been discovered in the area.
Cypango is also continuing detailed indicator mineral sampling and
geophysical surveying over targets at the terminus of the T-49 and T-60
trains in the west central and southwest portions of the property and is
expected to define further targets for drilling shortly.
Cypango, through a joint venture agreement, has the right to earn a 51%
interest in the Yamba Lake property from Mill City Gold Mining and
Tanqueray Resources by incurring $5,000,000 in exploration expenditures on
the property and the issuance of 300,000 shares by October 31 1999.
Cypango's interest may be increased to 70% by completing a feasibility
study on the property by December 31 2001.
Regional programs continue on the balance of Cypango's 3.4 million acres on
the Slave craton in the Northwest Territories. These programs are intended
to further develop a series of kimberlite indicator mineral dispersion
trains into target areas for the purpose of drill target selection.
(c) Copyright 1997 Canjex Publishing Ltd. canada-stockwatch.com
Dave |
