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2024-03-22_GENERAL DOCUMENTS - C1981010
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2024-03-22_GENERAL DOCUMENTS - C1981010
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Last modified
4/3/2024 8:11:37 AM
Creation date
4/3/2024 8:10:56 AM
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DRMS Permit Index
Permit No
C1981010
IBM Index Class Name
General Documents
Doc Date
3/22/2024
Doc Name
Proposed Decision and Findings of Compliance
From
DRMS
To
Trapper Mining, Inc.
Type & Sequence
SL24
Permit Index Doc Type
Findings
Email Name
RAR
JLE
Media Type
D
Archive
No
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by DRMS. The bond release blocks drain to the Middle Flume and East Pyeatt drainage systems. <br /> Ponds, dams and pond slopes were in good functioning order with adequate sediment storage capacity. <br /> Erosional features and sediment transport were evaluated during the inspection. A number of erosional <br /> features were identified over the course of the inspection. The operator agreed to make the necessary <br /> repairs in a timely manner. DRMS evaluated sediment transport through both observation and analysis <br /> of the data submitted by TMI. TMI's data comprised vegetation data, an evaluation using the Universal <br /> Soil Loss Equation and SEDCAD analysis. DRMS's evaluation of the data found that sediment <br /> transport during surface runoff over the bond release block was equal to or less than sediment transport <br /> over the same area under pre-mining conditions. Results and methodology are further discussed in <br /> section: Observation and Findings, Sedimentology of this findings document. <br /> Bond Release Blocks Delineation <br /> As discussed in permit section 4.4.1,reclaimed parcels are compared to three different range standards <br /> based on elevation: <br /> 1. Range site A standards apply to elevations greater than 7200 feet. <br /> 2. Range site B standards apply to elevations between 6700 and 7200 feet. <br /> 3. Range site C standards apply to elevations below 6700 feet. <br /> with parcels delineated based on: <br /> 1. Pit name. <br /> 2. Range site type. <br /> 3. Initial year of seeding. <br /> In accordance with permit section 4.4.1.5, contiguous areas reclaimed as Range Site A and Range Site <br /> B seeded in the same year and receiving similar reclamation practices may be combined into one range <br /> site AB parcel. When Bond Release Blocks (BRB) are comprised of both Range Site A and Range <br /> Site B parcels, the more stringent reclamation success standards for Range Site A shall apply to the <br /> combined data. <br /> Trapper Mining, Inc. provided, in the SL24 application, documentation of the seed mixtures planted <br /> for each parcel. Seed mixes used were in accordance with the approved reclamation plan. The four <br /> parcels making up the 298.3 acre bond release block in SL24 and shown on Map 1 of page 4 of this <br /> document, comprised a mix of range site A and B, and therefore were aggregated. The revegetation <br /> standard for range site A was used to evaluate revegetation success since this designation represents <br /> the most conservative standard in accordance with section 4.4.1.5 of Trapper's permit. <br /> The reclaimed landscape was evaluated for evidence of erosional features. Evaluation of the post- <br /> mining land use was considered during the Division's review of the bond release application. The <br /> specific parcels within SL24,the seed mix used,verified topsoil depths, and the dates of previous Phase <br /> I bond releases indicated in the application and submitted to DRMS have been verified by DRMS. <br /> IV. OBSERVATIONS and FINDINGS <br /> During the bond release inspection conducted on 11 October 2023, the following observations were <br /> made. For all parcels, the vegetative cover was consistent with the vegetation sampling results reported <br /> Permit Number C1981010 <br /> SL24 Page 8 of 16 <br />
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