Allocation of potential value socio-ecology post tin mining Kolong in Bangka Island

Kolong is a water basin as an impact of post tin mining in Bangka Island. Kolong should be managed properly to minimize some impacts, improve the quality of socio-ecological, and the income of local citizen. The purpose of this study was to analyze the potential allocation of socio-ecology value of the post tin mining. The case studies are Kolong in the Central Bangka Regency. This research was used resources valuation methodology, ABAD model classification, and observations. To determine the relationship of social ecology of the Kolong using SEM WarpPLS. The result shows that revenue of economic value of kolong in Bangka Island is IDR 17.9 Billion/year from utilization of Water Supply System, raw water and aquaculture. The diversity Kolong utilization as production tool of social needed in Bangka Island are 6 % as Water Supply System, 9 % as aquaculture, 0.2 % as tourism, and almost 84.8 % unused and owned by local government and private companies. The changing of kolong system influence the changing of social systems. The social variables that are most affected are the technology and local population. Utilization of Kolong as the economic value depends on its classification which based on the ABAD..model.


Introduction
Exploration and exploitation activities of tin ore inBangka Island had big impact to physical change, spatial structure, social, and environment use.Its social impact should not be underestimated, the interaction between mining industry and the citizen could cause various of social problems, economic, culture, and public policy.The economic wellbeing enhancement is the hope of local citizen from mining industry in their area [1].
Exploration and exploitation tin ore in Bangka Island had left a post mining area which is flooded and called Kolong.Kolong's management not only related to environment aspects and economic, but also social, politics, and public policy [2].The environment restoration that has been done through partial ecologictechnical approach gradually lost its legitimacy and interest [3,4].Kolongs that was spread around Bangka have a big potential to be managed and used for citizen well-being and regional development.Regional government has tried to develop post mining area with various functions [5,6].These functions are for tourist attraction, community economic production facilities, raw water source, new settlement area, etc to preserve and optimize economics value, and post mining area ecologists.
For planning and implementing those policies, it is important to know and valuate economics and socioecology values.Valuation of potential value is used for classification and allocating Kolong of post mining potential utilization.The value of economic potential allocation and socio-ecology are used to make a strategy of management policy and Kolong of post mining utilization.The focus of research on Central Bangka Regency is believed to represents the conditions and characteristics of kolong on Bangka Island.The purposes of this research are to do economic valuations of kolong's utilization, socio-ecology valuations of utilization and management of Kolong, classify Kolong of post mining on Bangka Island and counts economic potential allocation, social, and ecology of Kolong on Bangka Island.
The aims of this study: 1. Conducting economic valuation and socio-ecological utilization of Kolong; 2. Classify the post tin mining of Kolong in Bangka Island; 3. Calculating the allocation of the potential economic, social, and ecological of the Kolong on Bangka Island.

Economic Valuation
Valuation method was used based on Ministry of Environment Regulation Number 15 year 2012.The total economics value reflects monetary value which is produced by ecosystem function of Kolong, both extractive and non-extractive, calculated by:

Classification of Kolong
Classification of kolong was done by ABAD (Access, Broad, Age, and Depth) model as shown in Table 1 and Table 2.

Classification of kolong
Based on NEA(the economic value of water) Study, Optimum water allocation for PDAM (local water company) and BBI(fish breeding centers) Sungailiat, in such condition that the sums of water economic value of Kolong Dam-3 Pemali for each corresponding 1.36 Billion/Year [11].Based on ABAD model classification, among 276 of inventoried Kolong at Central Bangka Regency, there are 27pcs for first class or 10%, 193 pcs for second class or 70% and 56 pcs for third class or 20%, after economic value was done, both of extractive or non-extractive.Regarding to this valuation, economic value of kolong on Bangka, calculated by the equation ( 1) and (2) was IDR 9.5 billion/year for Water Supply System utilization and fish cultivation, and IDR.17.9 billion/year for the Kolong itself.

Socio-ecology allocation
According to the perception of stakeholders, the utilization type of Kolong, the type of tourism utilization from of a tourist village and artificial edutourism [5].In this research, according to the perception of stakeholders, the utilization types of Kolong were as Water supply system, raw water for citizen, local asset, community settlement, and water resource for agriculture and industry.The reflective analysis of SEM WarpPLS as shown in Figure 2.

Table 1 .
Classification criteria according to social economic perspective

Table 2 .
ABAD model classification