Authors :
Siti Hardianti; Isdaryanto Iskandar
Volume/Issue :
Volume 7 - 2022, Issue 11 - November
Google Scholar :
https://bit.ly/3IIfn9N
Scribd :
https://bit.ly/3VDXrV6
DOI :
https://doi.org/10.5281/zenodo.7412179
Abstract :
One of the factors influencing the achievement
of production targets in mining companies, especially in
open pit mining, is weather. When using the open-open
method, the weather or rain is one of the factors that will
serve as a hindrance to the work, which causes a slippery
recovery process. However, some measures are usually
carried out to avoid slippery conditions after rainfall when
the conveyance re-enters the mine road, as well as to avoid
accidents and keep production running according to plan.
Based on data from late August 2022, it was found that the
slippery ratio in Pit 9 was above the company’s set plan,
which should have been 40% of the rainy hour budget.
According to data on rainfall in August 2022, the total
number raining hours per day was approximately 23 hours
with rainfall reaching 260 mm/day. The slippery ratio,
which was more than expected, even reached 86%,
affecting production with an overall loss of 47,220 Bcm in
August 2022. Therefore, improvements were made to
reduce the slippery ratio by layering the hauling road with
a layer of base coarse material (gravel). Furthermore,
from the results of the analysis and calculations, it was
discovered that one segment of the hauling road OB (Fast
Track) with a length of 919 m, required a base course of
6,891 m3, while the coal hauling road in the 3.5 km
segment, which had a length of 865 m needed a base coarse
of 5,188 m3. It was also confirmed that the coal hauling
road in the mars road segment, with a length of 970 m,
required a base coarse of 5,819 m3. To meet these layering
needs, base coarse material was taken from 2 different
sources. The materials used as the base coarse were
ultramafic igneous rocks, namely Serpentine and
Peridotite. In addition, it was observed that after coating
each predetermined segment with the igneous rocks, the
slippery ratio improved to 38% or an average of 1.13 hours
in September after spreading the base coarse. This is in
accordance with the standard parameters specified by the
company, which is 40%.
Keywords :
Slippery, Base Coarse, Ultramafic Rock.
One of the factors influencing the achievement
of production targets in mining companies, especially in
open pit mining, is weather. When using the open-open
method, the weather or rain is one of the factors that will
serve as a hindrance to the work, which causes a slippery
recovery process. However, some measures are usually
carried out to avoid slippery conditions after rainfall when
the conveyance re-enters the mine road, as well as to avoid
accidents and keep production running according to plan.
Based on data from late August 2022, it was found that the
slippery ratio in Pit 9 was above the company’s set plan,
which should have been 40% of the rainy hour budget.
According to data on rainfall in August 2022, the total
number raining hours per day was approximately 23 hours
with rainfall reaching 260 mm/day. The slippery ratio,
which was more than expected, even reached 86%,
affecting production with an overall loss of 47,220 Bcm in
August 2022. Therefore, improvements were made to
reduce the slippery ratio by layering the hauling road with
a layer of base coarse material (gravel). Furthermore,
from the results of the analysis and calculations, it was
discovered that one segment of the hauling road OB (Fast
Track) with a length of 919 m, required a base course of
6,891 m3, while the coal hauling road in the 3.5 km
segment, which had a length of 865 m needed a base coarse
of 5,188 m3. It was also confirmed that the coal hauling
road in the mars road segment, with a length of 970 m,
required a base coarse of 5,819 m3. To meet these layering
needs, base coarse material was taken from 2 different
sources. The materials used as the base coarse were
ultramafic igneous rocks, namely Serpentine and
Peridotite. In addition, it was observed that after coating
each predetermined segment with the igneous rocks, the
slippery ratio improved to 38% or an average of 1.13 hours
in September after spreading the base coarse. This is in
accordance with the standard parameters specified by the
company, which is 40%.
Keywords :
Slippery, Base Coarse, Ultramafic Rock.
