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Pacific Booker Minerals Inc. Announces Morrison Lake Dilution Capacity
Vancouver BC, December 12, 2012: The Company would like to provide some
information on the dilution capacity of the Morrison Lake.
The Morrison Lake has a surface area of approximately 13.3 square kilometers, a
mean depth of 21.6 meters and a maximum depth of 62.9 meters. The lake volume is
286 million cubic meters. The Morrison Lake drains via the Morrison River into
Morrison Arm of Babine Lake.
The Morrison Lake is a dimictic lake, exhibiting four distinct “seasons”. The
lake is strongly temperature stratified in “summer”, followed by “fall
turnover”, a period of intense mixing induced by wind and penetrative
convection. The lake exhibits weak reverse temperature stratification in
“winter”. During “spring freshet”, the lake turns over again until solar heating
establishes summer stratification again. Most of the natural runoff into and
outflow from the lake is during spring freshet.
The annual volume of treated water from the Water Treatment Plant (“WTP”) and
potential seepage from the Tailings Storage Facility (“TSF”) into Morrison Lake
is a fraction of the Morrison Lake volume and natural inflow into Morrison Lake.
The Annual Natural Inflow Volume (the “Lake Turnover Volume”) into Morrison Lake
is 145 million cubic meters per year, which is about half of the lake volume.
The Annual Treated Water Volume from the WTP (at upper bound estimates) on
closure is 1.80 million cubic meters per year, which is 0.63% of the lake volume
and 1.24% of the natural lake inflow. The Annual Potential Seepage Volume from
the TSF is 0.09 million cubic meters per year, which is 0.03% of the lake volume
and 0.06% of the natural lake inflow.
The Morrison Lake has an overwhelming dilution capacity in proportion to the
relatively low volume of treated water from the WTP and potential seepage from
The Morrison Lake Effects Assessment concluded that efficient mixing within the
lake would be obtained and that the changes in predicted lake metal
concentrations, using upper bound loadings, due to the project are below BC
Water Quality Guidelines 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 environment.
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On Behalf of the Board of Directors
Erik Tornquist, Director