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reduce slightly the area of influence along the southern and <br />i, western boundaries of the mine, making the indicated area of <br />influence even more conservative. <br />Structural discontinuities (faults and fracture zones) <br />represent planes of weakness in the bedrock which can affect the <br />nature of subsidence profiles. The type of detrimental effect <br />that the fault may have on a mine subsidence profile would be <br />that of an increase in the vertical and/or lateral strains at the <br />surface over a very highly localized area. A graphical depiction <br />of the general effect of fault position and orientation on the <br />final surface subsidence profile is shown on Figure 4. This type <br />of impact may not be significant except in areas where permanent <br />structures or facilities exist which may be sensitive to those <br />strains. Based on geologic information provided by Dorchester, <br />the mapped areas of known faulting are positioned in such a way <br />as to have no significant effect on any permanent structures or <br />facilities. <br />2.8 Impacts to Surface Drainage <br />Newlin Creek is the only significant defined drainage <br />bisecting the mine plan area. As a result of the Florence City <br />Watec diversion above the mine property, Newlin Creek rarely <br />flows across the property except in response to precipitation <br />events and snow melt. It should, therefore, be characterized as <br />an ephemeral drainage. All other minor drainages on the property <br />are ephemeral as well. <br />. It is possible that some temporary disturbance to the <br />hydrologic flow of the ephemeral drainages could occur. <br />24 <br />