Idaho Administrative Code
Title IDAPA 58 - Environmental Quality, Department of
Rule 58.01.13 - RULES FOR ORE PROCESSING BY CYANIDATION
Section 58.01.13.204 - DESIGN CRITERIA FOR TAILINGS IMPOUNDMENTS
Universal Citation: ID Admin Code 58.01.13.204
Current through August 31, 2023
01. Engineered Liner System. In addition to meeting the general liner requirements in Subsection 200.06.b., the engineered liner system plans and specifications must provide for the following. (3-24-22)
a. Geomembrane liners with a minimum
thickness of sixty (60) milli-inches (one point five (1.5) mm) or equivalent
liners approved by the Department. (3-24-22)
b. A system to limit hydraulic head over the
geomembrane liner that preserves the integrity and long-term performance of the
liner system and includes the following: (3-24-22)
i. A system to reduce excess pore pressure
within the tailings; and (3-24-22)
ii. A plan for managing the depth, area, and
volume of process water occurring above the tailings surface and in direct
contact with the liner, including thresholds and contingency measures to manage
excess accumulation of process water in the facility.
(3-24-22)
c. Monitoring
points that will provide for early detection of discharges of pollutants.
(3-24-22)
02. Enhanced Containment Criteria. An enhanced level of containment may be required by the Department for all of the tailings impoundment or for a portion thereof after considering the following factors: (3-24-22)
a. The anticipated characteristics of the
material to be deposited; (3-24-22)
b. The characteristics of the soil and
geology of the site; (3-24-22)
c.
The methods employed and degree to which the hydraulic head on the liner is
minimized; (3-24-22)
d. The extent
of and methods used for material stabilization and recycling or neutralization
of process water; (3-24-22)
e. Area
and volume of process water; (3-24-22)
f. The depth from the surface to all ground
water; (3-24-22)
g. The methods
employed in depositing the impounded material; and (3-24-22)
h. The proximity to surface water and the
ground water interactions with surface water. (3-24-22)
03. Tailings Treatment. Tailings impoundments are restricted to a maximum of fifty (50) mg/L WAD cyanide concentration in the liquid fraction unless otherwise approved by the Department. (3-24-22)
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