REP47808 - Laserfiche WebLink

Home Browse Search

manner presented in the prior study, i.e. gravity flow in western parts of the mine and gravity flow augumented by pumping in the eastern parts of the mine. The existing sumps continue to be used. Those sumps are in the northern and eastern portions of the mine. For example, the northern sump, which is the main mine sump, has flooded approximately 85 acres, which automatically eliminates this and the adjacent area from the study. The survey was conducted by traveling along all of the accessible main entries and noting the presence of measurable flows of water. Where submains intersected the mains, the flows from the submains were isolated and noted on the map. If the flow was substantial, it was traced to its source unless safety prohibited. In prior years, the largest single source of water to the No. 5 Mine was from the first two of three normal faults encountered in the second west section of the mine. These faults, plus other flow from the west produced over half of the inflow to the mine. In 1987, the west portion of the No. 5 Mine was s~aaled, eliminating access to those sources of inflow. During the course of the study measurements were obtained by using a 1" and 8" cutthroat flume, or where conditions allowed, a measuring container and stop watch. At the time of measurement a water sample was obtained and was analyzed for temperature, pH, and EC. The temperature was taken at the time of sampling, while the pH and EC analysis were performed at CT&E's laboratory located at the mine. In the eastern portion of the mine there are no measured significant sources of water. The water that is made is pumped to the mine's main sump. It is assumed that this water is being made at mine faces. However, this cannot be proven due to mine conditions. At this time the No. 5 Mine discharge being totalizing meters set on each of being a 12" cutthroat flume installed give a total discharge record, while reading. Both are monitored on a weE provide a better record of the discha from the two sources provides a method be measured in the mine due to safety meters are summarized on Table 5. Th the meters, was 554 gpm for 1987. is measured in two ways. The first the No. 5 Mine's pumps. The second in the discharge stream. The meters the flume provides an instantaneous kly basis. Of the two, the meters rge. The discharce record obtained for estimating in~Flows which cannot constraints. The data for the pump average flow rate, as measured by Table 5 - No. 5 Mine Discharge Data - Meter Records Average Discharge (9Pm) Date For Week To Date 01/07/87 601.13 !i72.59 01/14/87 585.20 !i72.66 01/22/87 591.79 !i72.79 01/29/87 598.58 572.94 02/03/87 0.00 !i69.67