In exploration, the investigation of prospective area encounters several barriers of land ownership, budget limitation, and exhausting permit procedures. To speed up the exploration activities of bauxite deposits and bauxite characteristics, grades of the gap areas should be simulated based on the available test pit data sets. This study aims to address the limitations and to optimize the exploration boundaries using the R project for statistical computation. R data analysis weaves the framework of kriging that required information from the adjacent data. This study utilizes the geochemical data of Al 2 O 3 , Fe 2 O 3 , SiO 2 , and TiO 2 from 296 test pit sampling points. The geochemical data used for R analysis were taken from bauxite horizon, while the other mineralogical properties were taken entirely from the exposed bedrock and test pit data. To verify the result of R analysis, recent data of the simulated area were used as a comparison. The R result shows the prediction value is slightly below the actual value of Al 2 O 3 . The kriging simulation of Al 2 O 3 was correlated with test pit and mineralogical characteristics of samples. This reveals the predicted value of simulation closely represents the true value of Al 2 O 3 grades. Extrapolation results of Fe 2 O 3 and RSiO 2 with regards to Al 2 O 3 grades suggest that higher grade of bauxite underwent desilication and deferruginization as evidenced by a high value of Index of Lateritization. It can be inferred that this attempt points out the advantages of a quick and reliable projection of bauxite laterite deposits from the limited parameters

This study aimed at detecting the presence of groundwater in Masda Makmur Village, Rambah Samo District, Rokan Hulu Regency, using the Schlumberger configuration geoelectric method. The study consisted of 3 sounding points within every 100 m sounding track length. The measurement data is processed using IP2WIN software and Progress to see layer data below the ground level based on the value of the resistivity type. The results showed that the estimated groundwater could be found on track one with a kind of resistivity value of 7,44 Ωm at a depth of 15-22 m. Alleged groundwater can be found on the second track with a type of resistivity value of 75,73 Ωmat a depth of 13-18 m, and the estimated groundwater can be located on the third track with a kind of resistivity value of 82,52 Ωm, 93,26 Ωm. The deeper and the lower resistivity value shows that the layer has the potential as a carrier layer of groundwater (aquifer). Sounding 1 and 2 have the potential to make bore wells which are thought to be depressed aquifer. The results of this study can be used further for mapping the location of community boreholes.

Cijeruk known as a strategic location that is still very close to the Mount Salak area, but also close to the urban area of Bogor itself. This causes the area to have the potential to have good water absorption, but it also has the potential to be disturbed by water absorption due to internal and external factors in the research area. For this reason, it is necessary to know the water absorption and infiltration rate in order to see the advanced conditions of the research area. In order to know this, researchers need to obtain primary data by processing in the field using a Double Ring Infiltrometer (Indonesian National Standard, 7752:2012); while secondary data were obtained from previous researchers, as well as official bodies in Indonesia. The rainfall at the nearest Citeko station per 5 years reaches more than 3000mm, namely 3168.8mm, indicating that the research area has a very high potential for rainfall. In addition, it can be concluded that the research area has a type of overburden in the form of loamy sand with flat to steep areas in 4 observation locations, while the other 5 observation locations are flat to very steep. Then, the results obtained in the Cijeruk area obtained 2 units of infiltration rate, namely sufficient infiltration rate with an infiltration rate of 0.192 m/day to 0.312 m/day and a high infiltration rate with an infiltration rate of 1.08 m/day up to 5.04 m/day. indicates that the water catchment area is classified as good.

Infiltration rate and rainfall are one of the parameters in determining water catchment areas. In an area that has a high level of rainfall, it is very good to be a water catchment area. Water catchment areas must be maintained and protected so that they can be used to incrase groundwater reserves and prevent flooding, so a spatial plan is needed in determining water catchment areas. This study aims to determine the rate of infiltration in the ara of Mount Pancar, Bogor, West Java. Infiltration rate data was collected directly in the field using a double ring infiltrometer and rainfall data was obtained from BMKG data at Citeko Station. The final result of these data will be made a map of the infiltration rate and rainfall map. The results of the study in the study area obtained an infiltration rate of 0,096 m/day – 0,553 m/day with rainfaal of more than 3000 mm/year. From these data, it can be concluded that the rate og infiltration and rainfall are closely related to each other in determining water catchment areas.