<![CDATA[Penelitian ini mengevaluasi perubahan komposisi kimia pasir silika antara material pada front penambangan (pit) dan produk setelah pencucian serta pengolahan di PT Bupolo Indonesia, Kalimantan Tengah. Studi menggunakan desain observasional-komparatif deskriptif, bukan eksperimen kausal. Dua titik sampel diambil secara manual pada pit dan dua titik pada stockpile; sampel kemudian diuji di laboratorium PT Sucofindo menggunakan metode Inductively Coupled Plasma (ICP). Naskah sumber melaporkan hasil pit secara individual, sedangkan hasil stockpile tersedia sebagai satu nilai gabungan untuk dua titik sehingga statusnya sebagai sampel komposit atau rerata perlu diverifikasi. Rata-rata pit menunjukkan Fe₂O₃ 0,016%, TiO₂ 0,0385%, dan SiO₂ 99,62%. Pada stockpile, nilai yang dilaporkan adalah Fe₂O₃ 0,018%, TiO₂ 0,140%, dan SiO₂ 99,45%. Dengan demikian, Fe₂O₃ meningkat 0,002 poin persentase, TiO₂ meningkat 0,1015 poin persentase, sedangkan SiO₂ menurun 0,17 poin persentase. Data ini belum mendukung klaim bahwa pencucian dan screening meningkatkan kualitas kimia atau menyebabkan perubahan tersebut karena sampel tidak terdokumentasi sebagai pasangan material yang sama dan tidak tersedia replikasi analitik maupun neraca massa. Proses plant tetap berfungsi untuk klasifikasi ukuran dan penghilangan pengotor fisik yang dapat terpisah melalui air dan pengayakan, tetapi efektivitasnya terhadap mineral pembawa Fe–Ti perlu diuji melalui sampling berpasangan, karakterisasi mineralogi, dan evaluasi recovery–grade. This study evaluates changes in the chemical composition of silica sand between mine-front (pit) material and product after washing and processing at PT Bupolo Indonesia, Central Kalimantan. The study applies a descriptive observational-comparative design rather than a causal experiment. Two sampling points were collected manually from the pit and two from the stockpile, followed by laboratory analysis at PT Sucofindo using an Inductively Coupled Plasma (ICP) method. The source manuscript reports pit results individually, whereas the stockpile is represented by one combined value for two sampling points; whether this value represents a composite sample or an average requires verification. The pit averages were 0.016% Fe₂O₃, 0.0385% TiO₂, and 99.62% SiO₂. The reported stockpile values were 0.018% Fe₂O₃, 0.140% TiO₂, and 99.45% SiO₂. Thus, Fe₂O₃ increased by 0.002 percentage points, TiO₂ by 0.1015 percentage points, while SiO₂ decreased by 0.17 percentage points. These data do not demonstrate that washing and screening improved chemical quality or caused the observed changes because the samples were not documented as paired material from the same batch and no analytical replication or mass balance was reported. The plant process can still support size classification and removal of physically separable impurities, but its performance for Fe–Ti-bearing minerals requires paired sampling, mineralogical characterization, and recovery–grade evaluation.]]>
