PERMFILE115731

• Permit No: M1988112
• IBM Index Class Name: Permit File
• Doc Date: 3/2/1989
• Doc Name: MONITORING
• Media Type: D
• Archive: No

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1.1 Monitoring
~' Early developmem and implemea[adon of a monitoring program are esseadal for proper slope design
and pi[ operaaam. Ia nay open ptt mime some slope iastabiliry ran be expeued, varying form beach
sloughing to large-scale slope movement It is important tm disda.,uish slope dup(acememts from slope
failures that would economically influence the operation. Slopes can be safely maned even [hough they
show duplacemeat rates up [a several feet per month.
u Objectives of SIope Monitoring
A monitoring scheme should provide sys[ematic informadon about the magmimde, rate, and direction
of slope movements. This data base will provide a detailed history of the slope and ensure a me[hod
' for providing advance warning of slope failures.
The primary objeuive of a pit slope monitoring program are:
1) To mamtaia safe operarioaal procedures far the pro[euioa of personnel and equipment
' 2) To provide advance notice of instability, thus, allowing for the modificarioa of mine plans to
m,n;m;~~ the impact of slope displacement and
3) To provide geotechnied information useful for analyses of the slope failure mechanisms, and
' for conducting fume redesign of the slope.
L3 Survey Network
' The survey network has several primary fuaaioas:
1) It es[ablishes a surveillance svs[em to desert initial sages of slope insrabili[y;
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2) I[ provided a detailed movement history is terms of disnlaremeat d
unstable areas; and
3) It defines the euem of the failure areas.
Primary survey points, used to tie the observation stators co the mine grid baseline, should be located
on stable ground behind the influence of pit e~tvation. These relatively prrmanMr stations are
avai]able in det'**++;~+++g whether movement of the observation statovs has occurred as a result of
slope instability.
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ole. A locttion 2 to 3 m above the
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toe
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Prism targets should be attached to beach fares, if poss
usually preferred. Minor raveling may dislodge the prism if it is looted near the out. If the tazget is
near the toe, ;t could be covered relatively quir]dy by raveled rock debris. Ia some areas, the prism
' refleuors wiIl have to be mounted on stnrdy tripods az seleued monitoring points. It is but to allow
newly installed targets to stabilve for one week before readings begin. Initally, the readings maybe
somewhat erratc, but anoverdll trend should soon bemme apparent
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ten mon
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e macs are o
nstab
ty. Sta
The frequenry of monitoring will depend oa the degree of
amauaiIy or semi-annually. Suspect arras should be storeyed az least once a man[h as part of a regular
monitoring routae. Adiveiy moving slopes shoa(d be monitored weekly, or even more ftequeaty if
the situation warrants

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