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Pacific Booker Minerals Inc. Addresses Morrison Lake Water Quality
Vancouver BC, November 28, 2012: The Company would like to provide some
additional information on the effects of the Morrison Copper/Gold Project on the
Morrison Lake Water Quality.
On closure, all surface water and excess Tailings Storage Facility (“TSF”) water
will be directed to the open-pit, which will be allowed to be filled with water
to a level below the level of Morrison Lake. The open-pit water will be treated
by a high-density sludge (“HDS”) water treatment plant. A conceptual design of a
HDS water treatment plant was carried out by SGS-CEMI. The plant is capable of
treating the full range of water quality estimates in the open-pit.
In August 2011, in a letter from Ministry of Energy and Mines (“MEM”), the MEM
along with its consultant Lorax Environmental stated that “MEM considers a HDS
lime treatment plant to be proven technology that is capable of providing
effective and reliable means of treating Morrison TSF and open-pit water to
protect the environment”.
The treated water from the HDS treatment plant will be transported, via a
pipeline, to the northern section of Morrison Lake. The pipeline will extend to
the deepest portion of the lake and discharge vertically upward from a depth of
approximately 60m (197feet) from a single port diffuser into the lake.
The assessment of the diffuser design and the prediction of water quality in
Morrison Lake were carried out by Dr. Gregory Lawrence PhD, PEng of the
University of British Columbia. The BC Environmental Assessment Office undertook
a third-party review of the lake effects, which was carried out by Dr. Bernard
Laval, PhD, PEng, also of the University of British Columbia.
Dr. Laval concluded that a minimum 100:1 dilution in the concentration of
treated water, within the edge of the mixing zone, could be attained over a
summer stratified period with a properly designed single port diffuser, even
considering a prolonged summer stratified period due to climate change. Even
higher dilution and more efficient mixing within the lake could be obtained with
a multi-port diffuser. Additionally at a 100:1 dilution, there is no concern of
developing density stratification that cannot be mixed by seasonal overturn.
The Morrison Lake effects assessment report concluded that the changes in
predicted lake metal concentrations, using upper bound loadings, due to the
project are below BC Water Quality Guidelines (“BCWQG”) and nominally above
baseline. The Company believes that the risk of a significant adverse effect is,
therefore, negligible and that the design is protective of the aquatic
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On Behalf of the Board of Directors
Erik Tornquist, Director