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J-12 <br /> Attachment A <br /> Grazing Calculations <br /> Initial stocking rate calculations were used for determining carrying capacity as outlined below. <br /> 1. Determine Total Production of Area <br /> • USGS utilization for forage production on rangelands <br /> 2. Calculate total available forage <br /> • Total available forage=Total Production * (Harvest efficiency)0.5 *Allotment Size <br /> 3. Determine Pounds per month intake for a 1,000-pound animal <br /> • Intake=1,000-pound animal *80%of bodyweight <br /> 4. Calculate Proper Stocking Rate: <br /> • Stocking Rate=Available Forage/Pounds Eaten per month <br /> 5. Convert for animal type you are using with an Animal Unit Equivalents(AUE) <br /> • Stocking Rate/Animal Unit Equivalent <br /> 6. Determine number of animals that can be grazed over allotted time <br /> • Number of animals=Animal Unit month for class of livestock/Number of months on allotment <br /> Calculation Results for Stocking Rate <br /> 1. See Table in method section for forage production per acre per soil type <br /> 2. Total available forage - 6,185,390 total amount of forage on site * 0.5 (Harvest efficiency) <br /> =3,092,695 total pounds available forage for grazing <br /> 3. Intake of forage by cattle-1,000 pounds(standard weight for grazing calculations) *80 percent of <br /> body weight(typical amount eaten by cattle)=800 pounds/month of vegetation intake per animal <br /> 4. Stocking rate - 3,092,695 pounds available/800 pounds per month intake requirement <br /> =3,866 animals per month <br /> 5. Animal unit month for class of livestock - 3,866 animals per month/1.4 animal equivalent <br /> (represents 1,400-pound cow-calf combo)=2,761 animals/month <br /> 6. Number of animals per year-2,761 animals per month/12 months=230 animals that the Site can <br /> support for 1 year of grazing. <br /> Z:\Shared\Projects\11478\114782003 Keenesburg Mine No.2 Project\NS\State Mining Permit\100-Rangeland Cap <br /> Report\Report\Attachments\Attachment A\2019-Keenesburg-Attachment A-Grazing Calculations.docx <br /> Keenesburg No. 2 Mine_112 Reclamation Operation—November 22, 2019 <br />