Pemetaan Sebaran Kadar Al2O3 dan RSiO2 Pada Endapan Laterit Bauksit Menggunakan Pendekatan Metode Interpolasi Ordinary Kriging Dan Inverse Distance Weighting
ABSTRAK Bauksit, sebagai bijih utama aluminium, mempunyai kualitas yang baik jika mengandung kadar alumina (Al2O2) yang tinggi dan reaktif silika (RSiO2) rendah. Penelitian ini dilakukan untuk memetakan distribusi spasial kadar Al2O3 dan RSiO2 menggunakan metode interpolasi ordinary kriging (OK) dan inverse distance weighting (IDW). Fitting variogram dilakukan dengan model spherical, exponential, dan gaussian, dan pemilihan variogram dilakukan dengan parameter residual sum of square (RSS). Dalam proses interpolasi IDW menggunakan power 1, 2, 3 dan 4. Evaluasi metode interpolasi terbaik dilakukan dengan parameter root mean square error (RMSE) dan mean error (ME). Hasil penelitian menunjukkan bawa metode interpolasi OK lebih baik dibandingkan dengan metode IDW. Peta hasil interpolasi OK menggambarkan bahwa distribusi bauksit dengan konsentrasi kadar Al2O3 ≥ 48% dan RSiO2 ≤ 5% menempati kurang lebih 50% dari luas daerah penelitian. 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