Definitions

The terms “Application,” “As-built Submittal,” “Component or Phase,” “Cyanidation,” “Cyanidation Facility,” “Cyanidation Pollutants,” “Issued for Construction Data Package,” “Major Modification or Material Modification,” and “Permit” are defined in 39-118A, Idaho Code. The terms “Department,” “Director,” “Person,” and “Waters” are defined in Section 39-103, Idaho Code. The term “ground water” is defined in Section 39-121, Idaho Code. The terms “Beneficial Use” and “Best Management Practices (BMPs)” are defined in IDAPA 58.01.02. (7-1-26) 01. Degradation. When referring to surface water, “degradation” has the meaning provided in IDAPA 58.01.02, Section 010. When referring to ground water, “degradation” has the meaning provided in IDAPA 58.01.11, Section 007. (7-1-26) 02. Discharge. When used without qualification, any spilling, leaking, emitting, escaping, leaching, or disposing of a cyanidation pollutant into waters. (7-1-26) 03. Idaho Pollutant Discharge Elimination System (IPDES) Permit. A permit issued by the Department for the purpose of regulating discharges into surface waters. (3-24-22) 04. Land Application. A process or activity involving application of liquids or slurries potentially containing cyanide from the cyanidation facility to the land surface for the purpose of treatment, neutralization, disposal, or ground water recharge. (3-24-22) 05. Liner. A continuous layer of natural or man-made materials beneath and, if applicable, on the sides of ponds, tailings impoundments, or leach pads that restricts the downward and lateral movement of liquids. (3-24-22) 06. Material Stabilization. Managing or treating spent ore, tailings or other solids and/or sludges resulting from the cyanidation process to minimize water or all other applied solutions from migrating through the material and transporting pollutants associated with the cyanidation facility to ensure that all discharges comply with all applicable standards and criteria. (3-24-22) 07. Neutralization or Neutralized. Treatment of process water such that discharge or final disposal of the process water does not, or will not, violate any applicable standards and criteria. (3-24-22) IDAHO ADMINISTRATIVE CODE IDAPA 58.01.13 Department of Environmental Quality Rules for Ore Processing by Cyanidation Section 007 Page 4 08. Outstanding Resource Water (ORW). A high quality water, such as water of national and state parks and wildlife refuges and water of exceptional recreational or ecological significance, which has been designated by the legislature and subsequently listed in IDAPA 58.01.02. ORW constitutes an outstanding national or state resource that requires protection from point and nonpoint source activities that may lower water quality. (7-1-26) 09. Permanent Closure. Those activities that result in neutralization, material stabilization and decontamination of cyanidation facilities and the facilities’ final reclamation. (3-24-22) 10. Permanent Closure Plan. As defined in Chapter 15, Title 47, Idaho Code, and meets the intent and purpose of Section 39-118A, Idaho Code, and all applicable rules. (7-1-26) 11. Permittee. The person in whose name a permit is issued and who is to be the principal party responsible for compliance with these rules and the conditions of a permit. (3-24-22) 12. Pond. A process component that stores, confines, or otherwise significantly impedes the horizontal and downward movement of process water. This term does not include tailings impoundments or non-earthen containers such as vats and tanks. (3-24-22) 13. Post-Closure. The period of time after completion of permanent closure when the permittee is monitoring the effectiveness of the closure activities. Post-closure lasts a minimum of twelve (12) months but may extend until the cyanidation facility is shown to be in compliance with the stated permanent closure objectives and requirements of Chapter 15, Title 47, Idaho Code, and all applicable rules. (3-24-22) 14. Process Water. Any liquid intentionally or unintentionally introduced into any portion of the cyanidation process which may contain cyanide pollutants. (7-1-26) 15. Seasonal Closure. Annual cessation of operations that is due to weather. (3-24-22) 16. Sensitive Resource Aquifer. Any aquifer or portion of an aquifer listed in IDAPA 58.01.11, Subsection 300.01. (7-1-26) 17. Tailings Impoundment. A process component that is the final depository for processed ore from the mining, milling, or chemical extraction process. (3-24-22) 18. Temporary Closure. Any cessation of operations exceeding thirty (30) days, other than seasonal or permanent. (3-24-22) 19. Treatment or Treated. Any method, technique or process, including neutralization, that changes the physical, chemical, or biological character or composition of a waste for the purpose of disposal, or the end result of such action. (3-24-22) 20. Water Balance. An inventory and accounting process, capable of being reconciled, that integrates all potential sources of water that are entrained in the cyanidation facility or may enter into or exit from the cyanidation facility. The inventory must include the water holding capacity of specific structures within the facility that contain process water. The water balance is used to ensure that all process water and cyanidation pollutants can be contained as engineered and designed within a factor of safety as determined in the permanent closure plan. (7-1-26) 21. Water Management Plan. A document that describes the results of the water balance and the methods that will be used to ensure that cyanidation pollutants are not discharged from a cyanidation facility into waters unless permitted or otherwise approved by the Department. (7-1-26) 22. Weak Acid Dissociable (WAD) Cyanide. The cyanide concentration as determined by Method C, Weak Acid Dissociable Cyanide, D2036 of American Society of Testing Materials Book of Standards, “Standard Methods for the Examination of Water and Wastewater,” Method 4500-CN- I, or other methods accepted by the scientific community and deemed appropriate by the Department. (3-24-22) IDAHO ADMINISTRATIVE CODE IDAPA 58.01.13 Department of Environmental Quality Rules for Ore Processing by Cyanidation Section 010 Page 5 008. – 009. (RESERVED)