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<br /> <br /> <br />330 Grand Avenue, Suite C <br />Grand Junction, Co 81501 TEL 970.549.1015 www.entradainc.com <br /> <br /> <br /> <br /> <br /> <br />November 11, 2025 <br /> <br />Mr. Dillion Foster E.I.T. <br />River City Consultants Inc. <br />215 Pitkin Ave #201 <br />Grand Junction, CO 81501 via email <br /> <br /> <br /> <br />Subject: Colony Mine Water Discharge Sampling <br /> Report of Work Completed <br /> Garfield County, Colorado <br /> <br /> <br />Dear Mr. Foster: <br /> <br />River City Consultants Inc (River City) retained Entrada Consulting Group (Entrada) to collect a <br />water sample from discharge at the Colony Project Mine Portal (Site) located 12.5 miles north of <br />Parachute, Colorado on March 8, 2024. The Site is in the northwest quarter of the southwest <br />quarter of section 7, township 5 south, and range 95 west of the 6th principal meridian in Garfield <br />County, Colorado. Specifically, the coordinates for the sampling point are 39.627874° north <br />latitude and -108.103938° west longitude. <br /> <br />The sample was collected to provide insight into the mine water chemistry and highlight any <br />potential impacts from previous operations. <br /> <br />The Site was sampled using a peristaltic pump and polyethylene tubing directly from pooled <br />discharge water. Discharge water sampling parameters were measured using a YSI Multi- <br />parameter meter (YSI) to characterize water quality conditions. One water sample (20251014- <br />NPRWP-(ST-PORTAL)) was collected in containers appropriate to the specified analyses, <br />sealed, labelled, and placed into an ice-filled cooler for preservation. The sample was submitted <br />to Mesa County Public Health for E. Coli analysis and Pace Analytical in Mt. Juliet, TN for the <br />following analyses: <br /> <br />• Ammonia as Nitrogen by Method 350.1 <br />• Arsenic, Boron, Cadmium, Chromium, Copper, Iron, Lead, Manganese, Molybdenum, <br />Nickel, Selenium, Silver, and Zinc by Method 6010D <br />• Chloride, Nitrite, Nitrate, and Sulfate by Method 9056A <br />• Chlorine by Method 4500Cl G-2011 <br />• Cyanide by Method 4500CN E-2016 <br />• Hardness by Method 6010D <br />• Hexavalent and Trivalent Chromium by Method 7199 <br />• Mercury by Method 7470A <br />• Phosphorus by Method 365.4 <br />• Sulfide by Method 4500S2 D-2011