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Parameter <br />Unit <br />Value <br />Comment <br />Area <br />sq.ft <br />8.4E +08 <br />30.1 square miles <br />X length <br />ft <br />28,000 <br />5.3 miles <br />Y length <br />ft <br />30,000 <br />5.7 miles <br />Cell X width <br />ft <br />500 <br />Cell Y width <br />ft <br />500 <br />Cells in X direction <br /># <br />56 <br />Cells in Y direction <br /># <br />60 <br />Cells per layer <br />3,360 <br />Top elevation <br />ft msl <br />10,500 <br />2 miles <br />Bottom elevation <br />ft msl <br />5,000 <br />0.9 miles <br />Layer thickness <br />ft <br />250 <br />Uppermost layers vary due to topography <br />Layers <br />22 <br />Cells <br />73,920 <br />Material <br />Comment <br />Precambrian <br />Surrounds Diatreme on all sides <br />Tertiary vents <br />Primary volcanic eruptive centers, and orebody hosts <br />Tertiary overflow <br />Apron to east, low permeability, and not ore - bearing <br />Bound <br />X (E) (ft) <br />Y (N) (ft) <br />Comment <br />Lower left <br />26000 <br />42000 <br />Coordinates are CC &V mine coordinates <br />Upper right <br />54000 <br />72000 <br />Coordinates are CC &V mine coordinates <br />Subject: Cripple Creek Mining District Groundwater Model <br />Project: Cresson Project Hydrogeochemical Evaluation <br />Author: Adrian Brown, P.E. <br />Project #: 1385E <br />Date: 27- Feb -2012 <br />Page: 1 of 3 <br />AdrianBrown <br />1.0 INTRODUCTION <br />A model of the Cripple Creek Mining District has been constructed and run to evaluate the impact of mining <br />operations associated with Mine Life Extension 2 (MLE2). <br />2.0 MODELING METHOD <br />Type: Finite Difference Hydraulic Model <br />Method: MODFLOW <br />Code: Visual MODFLOW (V2.8.3) <br />Supplier: WHI Inc. (now Schlumberger Corp) <br />3.0 MODEL CONSTRUCTION <br />Locality: Cripple Creek, Teller County, Colorado <br />Area: 30 square miles centered between Cripple Creek and Victor, Colorado <br />4.0 MATERIALS <br />Mesh: Equal 500 foot grid horizontally, with max. 250 feet thick layers (except for uppermost layer <br />Plate 001 - Model Grid showing MLE2 Facilities and Diatreme Outcrop <br />Basis: Materials selected based on Qeometry of Diatreme <br />Plate 002 - Diatreme implementation in model <br />In Grid: Materials distributed over 22 layers based on 500 foot contours of diatreme <br />Plate 003 - Model layers with materials <br />Adrian Brown Consultants, Inc., 130 West 4th Avenue, Denver CO 80223 P:303- 698 -9080 F:303 -698 -9241 E: abrown @abch 2 o.com <br />