Model Design of the Mine Drainage System Kaolin Mining Site

Djawani Gunung Abadi, Trenggalek Regency, East Java Province

Avellyn Shinthya Sari

, Yudho Dwi Galih Cahyono

, Eka Putra Yolendra, Yazid Fanani,

Esthi Kusdarini

and Fairus Atika Redanto

Mining Engineering Department, Institut Teknologi Adhi Tama Surabaya,

Jl. Arief Rachman Hakim 100, Surabaya, East Java, Indonesia

Keywords: Mining, Mine Drainage, Design.

Abstract: Mining drainage is aimed at minimizing water entering the front mining as well as removing water from the

mining front area. Djawani Gunung Abadi Ltd is one of the companies engaged in the mining industry kaolin

is located in Karangan District, Trenggalek Regency, East Java Province. This research was conducted with

the aim of designing a mine drainage system at Djawani Gunung Abadi Ltd so that water does not enter the

mining sites. From the results of the research and discussion carried out, a large amount of. The total water

discharge entering the mine site is 0.55 m

/second with an area rain catch of 19 Ha and bottom pit area of

6,046 Ha. Calculation of capacity the open channel is the width of the upper surface of the channel (B) of 1.1

m; channel base width (b) by 0.48 m; channel height (d) of 0.97 m; water depth (h) of 0.48 m; Tall guard (w)

of 0.49 m; channel slope by 2%; by channel wall coefficient (n) of 0.045; resulting in an open channel

reservoir capacity of 0.55 m

/s with a settling pond capacity of 2,500 m

1 INTRODUCTION

Be advised that papers in a technically unsuitable

form will be returned for retyping. After returned the

manuscript must be appropriately modified. Mining

drainage is one of the important aspects of open pit

mining related to working conditions, safety,

productivity and the environment where mine jetting

aims to minimize water entering the mining front and

remove water from the mining front area. The

company's mining system that applies this quarry

method, whose entire activity is directly related to

weather and climate, causes the mining front to come

face to face with water from rain and runoff water,

high rainfall can affect and even hinder mining

operations.

PT. Djawani Gunung Abadi is one of the

companies engaged in the Kaolin mining industry

located in Karangan District, Trenggalek Regency,

East Java Province. During mining activities, this

company does not yet have mining activities so that

https://orcid.org/0009-0009-5132-0040

https://orcid.org/0000-0001-6249-5967

https://orcid.org/0000-0002-7719-5614

during the rainy season the usual problem is the

presence of rainwater entering the mining site. When

there is high rainfall, the water from rainwater will

inundate the mining area which causes the mining site

to be muddy.

2 CASE STUDY AND

DESCRIPTION

Djawani Gunung Abadi Ltd is located in Trenggalek

Region, with the address National III Buluagung

street, Karangan District, Trenggalek Regency, East

Java Province. To reach the territory of PT. Djawani

Gunung Abadi, which is located in Ngentrong

Village, Karangan District, can be reached by using

the 7-land route. With a total time taken 4 hours 15

minutes do not use rest.

Sari, A., Cahyono, Y., Yolendra, E., Fanani, Y., Kusdarini, E. and Redanto, F.

Model Design of the Mine Drainage System Kaolin Mining Site Djawani Gunung Abadi, Trenggalek Regency, East Java Province.

DOI: 10.5220/0012108100003680

In Proceedings of the 4th International Conference on Advanced Engineering and Technology (ICATECH 2023), pages 331-335

ISBN: 978-989-758-663-7; ISSN: 2975-948X

 2023 by SCITEPRESS – Science and Technology Publications, Lda. Under CC license (CC BY-NC-ND 4.0)

331

Figure 1: Map of Research Location.

2.1 Local Geology

Tectonically, the Southern mountainous zone of Java

is a magmatic arc formed from the results of the

support activities of the Indian Plate - Australia and

the Asian Plate in the Late Oligocene - early Miocene.

This magmatic size stretches from west to east along

Java Island. The geological structures found in the

investigation area are minor stocky due to loading and

processing of larger geological structures. The strike

direction of the rock layer is generally relatively

West–East direction i.e. N 100º E, with a dip slope

between 15º. The research site is included in 2 (two)

rock formations, namely the Mandalika 8 (Tomm)

Formation which is composed of interspersions of

volcanic brection, lava and tuff, sided with tufan

sandstones, siltstones and clay rocks of late

Oligocene to Early Miocene age and Alluvium

Formation (Qa) composed of tholocene-aged keracal,

gravel, silt, and clay.

Figure 2: Geological Map Research Area.

3 METHODOLOGY

Djawani Gunung Abadi Ltd is located in Trenggalek

Region, with the address National III Buluagung

street, Karangan District, Trenggalek

Several methods of collecting information or

data were used in this study to gain a thorough

understanding of the subject matter that was the

focus of the investigation. The authors collected

information using primary data and secondary data,

two separate data collection methods. While primary

data is information collected from the actual field,

secondary data is information collected through

bookkeeping and companies. The author then uses

this information to help with troubleshooting.

3.1 Primary Data

Primary data is information collected by taking or

measuring directly in the field. The following are the

study's key findings:

● Rainfall data

Rainfall data is obtained from data from the

Central Statistics Agency and then used as data

for calculating rainfall plans so that water

discharge values are obtained. The rainfall data

used is data for the last 10 years so that

planning and analyzing rainfall plans is easier

and more accurate.

3.2 Secondary Data

Secondary data is information that has been

collected from sources other than the field, such as

literature or companies. In this study, the secondary

data were:

● Topographic map

Topographic Maps are obtained from the company.

Where this map is used by researchers to determine

the area of the catchment area.

● Geological map

Geological maps are obtained from the literature.

Where this map is used to find out the lithology or

rock layer at the research site so that it can be known

the possibility of rock layers becoming aquifers or

the possibility of groundwater.

● Land use map

Land use maps are obtained from the company or

from the web literature of the spatial plan and the

trenggalek regency. Where this map is used to help

determine the runoff coefficient.

● Map of the mine situation

MAP OF RESEARCH LOCATION

Legend

Map Indeks

Geological Map

ICATECH 2023 - International Conference on Advanced Engineering and Technology

332

A map of the mine situation was obtained from the

company. Where this map is used to find out the

conditions or situation at the mining site so that it

can determine the placement of open channels and

the location of the settling pond correctly.

3.3 Data Collection Methods

Researchers need a variety of supporting data to

support the need to research this research data. The

data retrieval method used is modified according to

the type of data collected as follows:

● Literature study

A literature study is a search for library resources

on the issues to be addressed in the study, including

information from journals, books, internet sources,

and library databases.

● Research data collection

The implementation of this research utilizes

various information collection techniques in an

effort to gain a general understanding of the subject

of the research focus. The authors used primary data

and secondary data, two different data retrieval

techniques, to collect information. Primary data

comes directly from the field. Secondary data, on the

other hand, comes from business and literature. For

the author's approach to problem solving, he uses

both techniques.

3.4 Data Analysis Techniques

After data collection, the next step is to organize the

collected data into groups for analysis. The

following data should be checked:

● Calculating rainfall plan

Then the rainfall data obtained is calculated with

the help of Microsoft Excel.

𝐶𝐻𝑅  𝑋 

𝑠

𝑆𝑛

𝑌𝑡 𝑌𝑛

● Calculating rainfall intensity

To calculate the intensity of precipitation using

the Mononobe calculation formula below.

𝐼

𝑅





𝑡







● Determine area of catchment area

the determination uses Arcgis 10.4 and Surpac

6.3 software to determine the catchment area based

on the catchment area that is expected to be a

watershed. Topographic maps are used to calculate

measurements in the mining area of Djawani

Gunung Abadi ltd.

● Calculating runoff water discharge

𝑄  0,278  𝐶  𝐼  𝐴

● Calculating open channel dimensions

Makes use of a trapezoidal cross-section to

determine the size of an open channel. Discharges

affecting the design of open channels are taken into

account when calculating the dimensions of open

channels.

● Calculating settling pond dimensions

To determine the dimensions of the settling pond

is adjusted to the pumping discharge and the volume

of rain runoff. Where the determination of the

dimensions of this settling pond is based on the

Ministry of Energy and Mineral Resources 1827 K /

MEM / 30/2018 concerning Good Mining

Engineering Rules.

Figure 3: Map of Djawani Gunung Abadi Ltd Area Water

Flow Direction.

Table 1: Rock strata properties.

Tilt Land cover / type

Runoff

coefficient

(C)

Rice fields, forests,

swamps

0,2

<3% (Flat) Plantation 0,3

Housing

0,4

Forests, plantations 0,4

3% -15%

Housing, 0,5

(Moderate)

The bushes are

rather s

arse,

0,6

Map Indeks

GROUND WATER FLOW

MAPS

Road

River

Contour Indeks

Contour

Research Location

Groundwater flow

Model Design of the Mine Drainage System Kaolin Mining Site Djawani Gunung Abadi, Trenggalek Regency, East Java Province

333

Table 1(continued): Rock strata properties.

Open field 0,7

Forest, 0,6

> 15%

Housing, 0,7

(Steep)

The bush is a bit

arse

0,8

Open land in the

mine area

0,9

4 RESULT AND ANALYSIS

Data on rainfall and rainy days used as mine drainage

analysis were obtained at the Central Statistics

Agency of Trenggalek Regency in 2022. This data is

sample data that is used as a calculation of runoff

discharge. The amount of rainfall and rainy day data

is as much as the last 10 years.

To calculate the size of the water flow, you need to

know the intensity of precipitation. Rainfall intensity

also known as the amount of rain per discrete amount

of time is used to describe rainfall levels.

Table 2: Calculation of rainfall intensity.

Channel

length

(meter)

Average

rainfall

(mm/hour)

Time

concentratio

(hours/day)

Intensity

Rainfall

(I)

4.950 110,46

73,4

4 0,0152

4.1 Open Channel Dimensions

Channeling at PT. Djawani Gunung Abadi uses the

channeling system is a trench. This channel serves to

accommodate and drain water into the settling pond,

in addition to the channel The existing trenches in the

company also aim to prevent runoff water from

entering the within the mining work area and does not

interfere with mining activities nor production.

Figure 4: DTH open channel dimensions.

4.2 Settling Pond Dimensions

The settling pond serves to deposit sedimentary

particles or mud before it is flowed to the river to the

north of the mine site. The dimensions of the settling

pond are designed based on runoff discharge in the

mining area where the settling pond must have a

larger capacity than the runoff discharge that will

enter the pond so that it can hold water according to

its discharge capacity.

Figure 5: Settling Pond dimensions.

5 CONCLUSIONS

The results of the open channel design of PT. Djawani

Gunung Abadi, can be concluded as follows:

1. The area of the rain catchment area based on the

results of data processing carried out can be

known, which is 190.000 m

2. The discharge of water entering the mine is

divided into 2 (two) namely runoff water

discharge and rainwater discharge that enters the

pit. The amount of runoff water discharge is 0.32

/hour and the rainwater discharge entering the

pit is 0.25 m

/hour. So that the total water

discharge entering the mine is 0.55 m

/hour.

3. The dimensions of the trench or open channel are

based on the results of the calculation of the

capacity of the open channel, namely the width of

the upper surface of the channel (B) of 1.1 m; the

width of the base of the channel (b) is 0.48 m;

channel height (d) of 0.97 m; water depth (h) of

0.48 m; Guard height (w) of 0.49 m; channel slope

by 2%; with a channel wall coefficient (n) of

0.045; So as to produce an open channel storage

capacity of 0.55 m

/sec, according to the amount

of total discharge of water entering the mining

site.

4. Settling pond design of PT. Djawani Gunung

Abadi is rectangular in shape with pool

dimensions, namely a pool width of 20 meters;

Groundwater level

Top View

Side View

ICATECH 2023 - International Conference on Advanced Engineering and Technology

334

pool height 5 meters; pool length 25 meters; with

the number of pools as many as 1 (one) pool. this

producing a settling pond capacity of 2,500 m

The capacity of the mini kola can connect the total

discharge of water entering the mine site for a

period of 1 hour, which is 2,375 m

/hour.

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Model Design of the Mine Drainage System Kaolin Mining Site Djawani Gunung Abadi, Trenggalek Regency, East Java Province

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