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CMC—Henderson Operations <br /> DRMS 2016 Annual Water Monitoring Report <br /> May 2017 <br /> Executive Summary <br /> This report provides a summary of the 2016 water monitoring data collected pursuant to the <br /> Climax Molybdenum Company (CMC) — Henderson Operations (Henderson) Technical <br /> Revision 16 (TR-16) to Permit M-1977-342 Groundwater Management Plan (GWMP). The <br /> Division of Reclamation, Mining and Safety (DRMS) approved the Henderson GWMP in July <br /> 2012. The focus of this report is 2016 data, however, historical data is included from the 2013- <br /> 2015 monitoring periods to allow for the assessment of trends over time. Sampling was <br /> conducted at the required locations in accordance with the GWMP and each sample was <br /> analyzed for the required parameters. <br /> In a memorandum dated April 14, 2015, the DRMS preliminarily accepted new proposed <br /> Numeric Protection Limits (NPLs) for indicator parameters at Mill Point of Compliance (POC) <br /> locations. In the 2015 Annual Report,these new NPLs were taken into consideration. Given that <br /> the NPLs were preliminarily accepted, the 2016 report will again be using the original NPLs of <br /> pH 6.5 to 8.5 until the new limits are formally accepted. <br /> Mine Water Monitoring <br /> Henderson observed pH values during 2016 that were below the NPL limits at POC location <br /> MNGW-I. Henderson continues to evaluate the groundwater system dynamics in the area of the <br /> MNGW-1 well. This evaluation will consider nearby drainages, as well as neighboring <br /> development rock from early mining activity. <br /> No other deviations or anomalies were observed at non-POC locations at the Mine. <br /> Mine water monitoring data for POC well MNGW-1 and non-POC long-term surface water <br /> locations BG-20, CC-10 and CC-30 are included in this report and presented both in a table and <br /> trend evaluation graphs. <br /> Mill Water Monitoring <br /> There were no deviations from established NPLs observed at Mill POC wells. <br /> Mill water monitoring data for POC wells MLGW-ACR, MLGW-7, MLGW-15 and MLGW-17 <br /> and non-POC long-term surface water monitoring locations WFR-20 and WFR-40 are included <br /> in this report and presented both in a table and trend evaluation graphs. <br /> 3 of 7 <br />