Brøyt X41 in Quarry

Job Report

The Site:

The Customer:

The Republic of South Africa is certainly better known for its gold mines than for its quarrying industry.

In a fast developing country like this, however, there is also a lot of quarry work to be done, producing materials for the cement industry, road building and general building purposes. The capital Johannesburg is situated inland at a height of about 2000 m above sea level, the city of Cape Town is an important port in the southwestern corner.

The Hippo Quarries Group, part of Anglo Alpha Cement Group is a large quarrying organization, operating quarries throughout the Republic of South Africa.

The Eikenhoff Quarry (Quarry No 2) is situated near to Johannesburg, and the Peninsula Quarry (Quarry No 1) is located near to Cape Town.

The Material:

9

Material to be loaded is large to average fragmented rock, occasionally even big boulders, and also partly well blasted mixed rock and earth overburden.

Site Organization: Normal drilling and blasting carried out and material loaded at face on dumptrucks to be transported to primary crusher.

Alternate faces worked.

'----~__,__~----'------~----'--~------'---~--'3 6 8

Loading /Production Quarry No 1:

Quarry No 2:

BR0YTX41 front shovel with 3.0 m 3 tooth bucket.

BR0YTX41 front shovel with 2,5 m3 tooth bucket .

Cat 769 truck for hauling

Wabco35c truck for hauling

Bucket fill factor

0,95

0,95

Average bucket content

0,95 · 3 2,85m 3

0,95 · 2,5 2,40 m 3

Time study

147 buckets in 85 min

301 buckets in 175 min

Average cycle time

34,7 s

34,3s

Hourly capacity

60·60·2,85 34,7

60·60· 2,40 34,3

= 296lm

= 252 lm

Equipment selected

3

/h

Average Loading time per truck

3,82 min

4,48 min

Average Waiting time per truck

5,12min

1,00 min

Average Number of buckets per truck

6,50

8,47

3

/h

Time studies dated June 1979

&0ytX41 Weight Engine Front shovel bucket Break-out force (bucket) Penetration force (bucket)

32 t 179 kW (243 hp) 3 m3 (2,5 m3 alt.)

17,0 t 20,0 t

Manufacturer:

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