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GENERAL38051
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Last modified
8/24/2016 7:57:58 PM
Creation date
11/23/2007 9:27:30 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1980244
IBM Index Class Name
General Documents
Doc Date
7/20/1995
Doc Name
CRESSON PROJECT PN M-80-244 PLACEMENT OF CARLTON MILL TAILING MATERIAL IN HIGHWAY 67 EMBANKMENT
From
CRIPPLE CREEK & VICTOR GOLD MINING CO
To
DMG
Media Type
D
Archive
No
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a • <br />July 14, 1995 -3- 953-2900.007 <br />A review of the grain size distribution for the material shows it to be a very well graded <br />material with almost 20 percent by mass passing the No. 200 sieve. The dry density of <br />the material was initially 119.8 pcf, or 95.5 percent of the standazd proctor. At the <br />completion of the test, the dry densin~ of the mixtwe increased only 0.6 pcf to 120.4 pcf, <br />or 95.9 percent of the standazd proctor. This is due to the well graded nature of the <br />mixture. <br />To date, standard Proctor values for raw Pad No. 2 material have yielded maximum dry <br />densities from 124.1 pcf to 127.7 pcf . This corresponds to 95 percent standadd Proctor <br />values to range from 117.9 pcf to i Z 1.3 pcf. The ma.~cimum dry density of the mixture <br />compazes quite well with the values for the raw Pad No. 2 material. Therefore, based on <br />the correlations to ma.~cimum dry density, the amount of settlement is not expected to be <br />significantly different for the two types of materials. <br />Based on the consolidation characteristics of the 20 percent Cazlton Tailings material and <br />80 percent Pad No. 2 mixtwe, Golder concludes that this mixtwe is suitable for Highway <br />67 Structural Fill. However, the monitoring of pore water presswe generated during fill <br />placement is required to verify that the stability of the structwe is maintained. Golder <br />recommends that a minimum of two pore water presswe monitoring devices be installed <br />at different elevations in the fill, and the pore water presswes be monitored as the fill <br />proeresses. Golder will also re-evaluate the stability for the Highway 67 Realignment <br />Fill to determine what maximum pore water presswe is acceptable. Should pore water <br />presswes be generated in excess of this maximum value during construction activities, <br />placement activities may have to be suspended until the excess pore water presswes have <br />dissipated to an acceptable level. <br />Presently, the pore water presswe monitoring system that is being considered by Golder <br />would consist of either Geokon model 45005 vibrating wire piezome[ers or presswe <br />transducers. As the cost for each is reasonably similar, and the final choice would be a <br />function of availability. <br />In order for this material to be used as fill, it is very important that the tailings aze <br />adequately mixed with the Pad No. 2 material to create a mixture that is homogeneous in <br />composition as well as moistwe content. If the two materials are not sufficiently mixed, <br />this could result in alternating layers of Pad No. 2 material and tailings at different <br />moistwe contenu, which would have significant effecu on the stability and consolidation <br />characteristics of the fill. In order to obtain a relatively homogeneous mirtwe, it is <br />recommended that the tailings material be mixed in with the Pad No. 2 material with a <br />disc. At no time will any alternating layers be allowed. Since the density and water <br />content of the fill effect the structural characteristics ofthe fill, the mixture wi{I have to <br />be compacted to a minimum 95 percent standard Proctor, with the moistwe content being <br />at or below optimum. This moistwe content window was selected with the intent of <br />minimizing any "pumping" that may occw during compaction of the Fill. It may also be <br />Golder Associates lac. <br />
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