<![CDATA[Abstract. The study was conducted at the Liunggunung Producers Cooperative, located in Liunggunung Village, Plered District, Purwakarta Regency, West Java Province, which holds a production operation permit for andesite mining. This research aimed to investigate the effect of haul road gradient on diesel fuel consumption by evaluating the actual haul road geometry, fuel consumption of haul trucks under both loaded and unloaded conditions, fuel consumption for each haul road segment, as well as the fuel ratio and fuel cost. The study utilized both primary and secondary data. Primary data included haul road geometry, equipment cycle time, working time, delay time, swell factor, fill factor, and actual fuel consumption, while secondary data comprised geological, topographical, rainfall, and equipment specification data. Data analysis was carried out by comparing the actual haul road conditions with the AASHTO standard to determine fuel consumption efficiency. The results indicated that the actual productivity of the loading equipment was 38.16 BCM/h, while the haul trucks achieved 35.11 BCM/h. Fuel consumption was recorded at 8.43 L/h for the loading equipment and 7.76 L/h for the haul trucks. After improving the haul road gradient and reducing the cycle time, haul truck productivity increased to 41.06 BCM/h, whereas fuel consumption decreased to 6.61 L/h. Furthermore, reducing the average haul road gradient from 15% to 12% lowered the fuel ratio from 0.22 to 0.16 L/BCM and reduced the monthly fuel cost from IDR 44,932,830 to IDR 38,216,349, demonstrating that haul road improvement significantly enhances operational efficiency and reduces fuel consumption. Abstrak. Penelitian dilakukan di Koperasi Produsen Liunggunung, Desa Liunggunung, Kecamatan Plered, Kabupaten Purwakarta, yang memiliki izin operasi produksi batuan andesit. Penelitian bertujuan mengkaji pengaruh kemiringan jalan angkut terhadap konsumsi bahan bakar solar, serta mengevaluasi geometri jalan angkut, konsumsi bahan bakar alat angkut pada kondisi bermuatan dan kosong, konsumsi bahan bakar setiap segmen jalan, fuel ratio, dan fuel cost. Data yang digunakan terdiri atas data primer (geometri jalan, waktu edar, waktu kerja, waktu hambatan, swell factor, fill factor, dan konsumsi bahan bakar aktual) serta data sekunder (geologi, topografi, curah hujan, dan spesifikasi alat). Analisis dilakukan melalui perbandingan kondisi aktual dengan standar AASHTO untuk memperoleh efisiensi penggunaan bahan bakar. Hasil penelitian menunjukkan produksi aktual alat muat sebesar 38,16 BCM/jam dan alat angkut 35,11 BCM/jam. Konsumsi bahan bakar alat muat mencapai 8,43 liter/jam, sedangkan alat angkut 7,76 liter/jam. Setelah perbaikan kemiringan jalan dan waktu edar, produksi alat angkut meningkat menjadi 41,06 BCM/jam, sementara konsumsi bahan bakar turun menjadi 6,61 liter/jam. Perbaikan kemiringan jalan dari 15% menjadi 12% juga menurunkan fuel ratio dari 0,22 menjadi 0,16 liter/BCM serta menekan fuel cost bulanan dari Rp44.932.830 menjadi Rp38.216.349.]]>
