Many people confront the problem of handling inorganic waste, this is also confronted by the people of Catur Tunggal Village, Depok District, part of Sleman Regency, D.I Province. Yogyakarta. Catur Tunggal Village is known as a village with a leading sector with several well-known campuses as the best educational places in Indonesia such as UGM, UNY, UPN "Veteran" Yogyakarta and others. In addition, there are also many hotels and large malls. This encourages the construction of boarding houses, the construction of hotels, malls, restaurants and the rapidly growing tourism sector. The rapid development has an impact on the environment, one of the impacts that arise is the problem of dealing with construction waste such as paralon waste, wood waste, cement wrapping paper and others. Currently, the waste generated from the construction sector has not been utilized optimally.If paralon waste is managed and utilized properly and processed by skilled hands, it can turn out to be interesting goods and have a high selling value. Opposite, it can also be an exotic work of art. It is enough with simple equipment and cheap additional materials to produce art items such as decorative lamps, bed lamps, wall decorations, sculptures, and so on, so that it is hoped that they can overcome the problem of inorganic waste, increase people's income and reduce unemployment.

The irregularities of nickel resource mining in Indonesia cause many serious environmental problems. Piles of leftover rocks on nickel mining waste dumps have the potential to be a source of heavy metal seepage into the water. This study was conducted to assess the impact of nickel mining in the Langgikima Subdistrict of the North Konawe Regency of Southeast Sulawesi Province. The focus is to assess the migration of hexavalent chromium (Cr6+) and iron (Fe) using MT3DMS to model the transport of solutes. The study's goal was to identify cr6+ and Fe concentrations in waste dumps and predict the spread of contaminants over a 20-year period of time. XRF (X-Ray Fluorescence) is done to determine the content of elements and minerals in rocks. Toxicity Characteristics Leaching Procedure (TCLP) is performed to estimate the concentration of Cr6+ and Fe in waste dumps. AAS (Atomic Absorption Spectrophotometer) to find out the content of Cr6+ and Fe in surface water and land water samples. The results showed the highest concentrations of Cr6+ of 0.0462 mg/L and Feat 0.8709 mg/L. Simulations without compacted clay coatings, Cr6+ and Fe contaminants could be transported consecutively by 2.7 km and 2.42 km while simulations used compacted clay layers with a hydraulic conductivity of 1 × 10−9 m/s of Cr6+ and Fe contaminants could be transported consecutively by 0.412 km and 0.467 km. It can therefore be concluded that heavy metals in the remaining rock piles from the waste dump can be transported into groundwater, and the action of using a compacted layer of clay must be taken to prevent contaminant migration into groundwater.

Urat kuarsa memiliki peran penting dalam pembentukan tekstur yang dapat digunakan untuk penentuan proses pembentukan dan korelasi tekstur dengan mineral bijih (Dong dkk, 1995). Hubungan tekstur kuarsa daerah penelitian menarik untuk diteliti karena menjadi acuan dalam menentukan zona prospek kehadiran logam mulia serta acuan eksplorasi lanjut. Tujuan penelitian ini menentukan hubungan tekstur kuarsa dengan kehadiran logam mulia serta logam dasar di daerah penelitian. Daerah penelitian berada di daerah Mekarbakti, Kecamatan Bungbulang, Kabupaten Garut, Provinsi Jawa Barat. Daerah penelitian termasuk dalam formasi Jampang yang terendapkan secara tidak selaras oleh satuan lebih muda Tak Teruraikan (Qtv). Litologi yang berkembang di daerah penelitian merupakann produk gungungapi seperti lava andesit dan breksi andesit. Litologi lain yang berkembang di daerah telitian yaitu batuan piroklastik seperti lapilli dan tuf. Intrusi yang berkembang di daerah penelitian yaitu intrusi andesit. Penelitian ini menggunakan 3 metode yaitu pengamatan detail lapangan, analisis mikroskopi bijih sebanyak tujuh sampel dan analisis Fire Assay Atomic Absorption Spectrophotometry (FA-AAS) dan Inductively Coupled Plasma -Optical Emission Spectrometry (ICP-OES) sebanyak tujuh sampel. Hasil pengamatan dan analisis laboratorium menunjukkan bahwa tekstur urat yang berkembang di daerah penelitian dibagi menjadi tujuh tekstur urat yaitu cockade, lattice bladed, saccharoidal, banded, comb, brecciated, colloform. Geokimia bijih pada daerah penelitian memiliki kadar yang cukup tinggi dan berasosiasi dengan tekstur urat kuarsa, antara lain tekstur brecciated