Sex: Male
Education:

• Doctor of Philosophy in Atmospheric and Environmental Sciences, University of Edinburgh, Scotland, 2022
• Master of Science in Geology, University of the Philippines Diliman, 2015
• Bachelor of Science in Biology, University of the Philippines Diliman, 2010

Field of Specialization:
Geochemistry

Researches:

Article title: Seasonal fluxes and sediment routing in tropical catchments affected by nickel mining.
Authors: Justine Perry T. Domingo, Mikaël Attal,Simon M. Mudd, Bryne T. Ngwenya,Carlos Primo C. David
Publication title: Earth Surface Processes and Landforms, 2021

Abstract
An important gap in the management of land erosion in mining-affected areas is the understanding of the entire sediment routing system and the links between sources and storage at the catchment scale. In this study, we examine sediment delivery and its seasonality in the nickel mining-affected Santa Cruz and Pamalabawan catchments in the Philippines. We monitored discharge, suspended sediment concentrations and suspended sediment loads across 13 sub-catchments with contrasting degrees of mining influence from June 2018 to July 2019. First, we show the importance of the size of the area that has been physically disturbed within our sub-catchments, with as little as 10–22% of relative disturbance area being enough to generate four-fold to eight-fold increase in the sediment yield relative to less disturbed and pristine areas. We found that sub-catchments with > 10% disturbance exhibit the highest sediment yields (15.5 ± 44.7 t km−2 d−1) compared with sub-catchments with < 10% disturbance (3.6 ± 17.7 t km−2 d−1) and undisturbed catchments (2.0 ± 5.7 t km−2 d−1). We also show that sediment flushing predominantly occurs in the most disturbed sub-catchments at the onset of the wet season. A small number of flood events transports the bulk of the sediment, with hysteresis effects being most pronounced in disturbed areas. Lastly, we show that floodplain sediment recycling exerts a key control on sediment delivery at both reach and catchment scales, with the relative contribution of floodplain sources to the sediment budget becoming dominant in the latter stages of the wet season- up to 89% of the total sediment export per storm event. This study highlights the importance of both degree of disturbance and sediment pathways in controlling sediment transport in mining-disturbed areas, and that considering the entire sediment routing system including intermediate stores is crucial to optimizing existing and future measures against siltation and potential contamination of trace metals and metalloids downstream of mining areas.
Full text link https://tinyurl.com/2yp9myb7

Article title: Siltation load contribution of nickel laterite mining on the coastal water quality of Hinadkaban Bay, Surigao Provinces, Philippines.
Authors: D C Apodaca, J P T Domingo, C P C. David and S D David Jr.
Publication title: IOP Conference Series: Earth and Environmental Science 191, 2018

Abstract
Satellite images of Hinadkaban Bay, in Surigao Provinces, Philippines have indicated quite extensive siltation. Apparently, hilltop mining operations and other anthropogenic activities have resulted to deposition of suspended solids into the stretch of Hinadkaban Bay. In this regard, a multidisciplinary team was dispensed to undertake study in line with determining the environmental conditions along Hinadkaban Bay. Coastal marine water samples and surface water samples were obtained in two separate occasions (March and October 2012) via grab sampling. It was found that soil erosion in the study area was exacerbated by mining operations, road constructions and other anthropogenic activities, with heavy siltation often observed in areas near causeways, stockyards or siltation ponds of mine companies. Mean total suspended solids data of 5.87 mg/L was obtained for samples collected during the dry season while as high as 1000 mg/L TSS was recorded during heavy runoff. Meanwhile, average concentration of total nickel in water samples ranged from 0.050 μg/mL during dry season to 0.25 μg/mL during wet season. On the other hand mean total chromium concentration ranged from 0.060 μg/mL (dry season) to 0.30 μg/mL (wet season). Results of this study shall contribute to the effort of protecting surface water resources and of optimizing their beneficial uses.
Full text available upon request to the author

Article title: Soil amelioration potential of legumes for mine tailings.
Authors: Justine Perry T. Domingo and Carlos Primo C. David
Publication title: Philippine Journal of Science 143(1): 1-8, June 2014

Abstract
Substrate fertility is an important constraint in the revegetation of active mining and mined out areas. In particular, the physical and chemical properties of tailings materials preclude any sustainable vegetation cover; more so if the usual practice of planting tree seedlings are used. Focus should first be given to transforming the tailings material into a more viable material for plant growth. This research tested the potential of two legume species, Centrosema molle and Calopogonium mucunoides, in the transformation of the tailings material and in the establishment of vegetation. Improvement in the levels of phosphorus and organic matter was observed in the legume-planted material after 4 months, while heavy metals including copper, arsenic, and cadmium have undergone significant reduction. Results suggest that these species could be effectively used to improve the soil conditions in abandoned mine areas and tailings dumps.
Full text link https://tinyurl.com/56hjx47s

Article title: Geochemical Characterization of Copper Tailings after Legume Revegetation
Authors: Justine Perry T. Domingo and Carlos Primo C. David
Publication title: Science Diliman 26:2, 61-71, 2014

Abstract
Knowledge on the geochemistry of mine tailings is important in understanding the challenges in establishing vegetation cover on tailings dumps and mined out areas. In this study, the mineralogy and trace element composition of copper tailings were examined. Two legume species, Calopogonium mucunoides and Centrosema molle, were utilized to investigate the possible effects of these plants in the geochemical development of mine tailings into soil-like material. The initial mineralogical and chemical analysis of the tailings samples indicated poor conditions for plant growth—minimal levels of major nutrients and organic matter as well as elevated copper concentrations. Despite these conditions, the two legume species exhibited good growth rates. Both legumes have likewise signif icantly reduced heavy metal concentrations in the tailings, indicating the possibility of metal hyperaccumulation in the plant tissue. The mineral composition has been retained even after revegetation; nevertheless, breakdown of primary minerals and subsequent formation of clay minerals were detected. These results provide insights on the transformation of toxic materials into habitable substrates for sustained plant growth.
Full text available upon request to the author

Article title: Legume and Grass Revegetation of Mine Tailings.
Authors: Justine Perry T. Domingo and Carlos Primo C. David
Publication title: Life-of- Mine 2014 Conference Proceedings. The Australasian Institute of Mining and Metallurgy, Brisbane, Queensland, Australia, pp. 525-533, 2014

Abstract
Addressing nutrient deficiency, among other factors, is vital to the growth and establishment of plants in mine spoils and tailings ponds. Although several organic amendments are available for this purpose, it is important to determine the appropriate ameliorant for the selected plant species. This research examined the effect of different amendments on the growth and ground cover of Centrosema molle, Calopogonium mucunoides and Sorghum spp._x000D_
in copper/gold tailings. Plant growth and ground cover drastically increased with the application of organic ameliorants, especially manure. Among the three plants, Calopogonium exhibited the best growth and has shown its capability to establish a dense ground cover even in unamended tailings. Results suggest that the plant species and the ameliorants used in this study could be effective in a low-input approach to mine rehabilitation.CITATION:Domingo, J P T and David, C P C, 2014. Legume and grass revegetation of mine tailings, in Proceedings Life-of-Mine 2014 , pp 525-534 (The Australasian Institute of Mining and Metallurgy: Melbourne).
Full text available upon request to the author

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