Pollution assessment and mercury speciation of small-scale gold mine (SSGM) tailings, sediments, and ore from Camarines Norte, Philippines

Authors

  • Kyla Mae T. Dela Cruz Mapua University, 658 Muralla St., Intramuros, Manila, Philippines
  • Juniela Anne T. Madayag Mapua University, 658 Muralla St., Intramuros, Manila, Philippines
  • Maria Carmencita B. Arpa Mapua University, 658 Muralla St., Intramuros, Manila, Philippines https://orcid.org/0000-0002-6657-6374
  • Jessie O. Samaniego Department of Science and Technology-Philippine Nuclear Research Institute, Commonwealth Ave., Diliman, Quezon City, Philippines https://orcid.org/0000-0003-1020-6224
  • Fern Rose A. Peregrino Department of Science and Technology-Philippine Nuclear Research Institute, Commonwealth Ave., Diliman, Quezon City, Philippines https://orcid.org/0009-0007-1485-5615
  • Rico Neil M. Quierrez Department of Science and Technology-Philippine Nuclear Research Institute, Commonwealth Ave., Diliman, Quezon City, Philippines https://orcid.org/0000-0002-8982-4801
  • Alexandria M. Tanciongco Department of Science and Technology-Philippine Nuclear Research Institute, Commonwealth Ave., Diliman, Quezon City, Philippines https://orcid.org/0000-0002-6585-5419

DOI:

https://doi.org/10.15243/jdmlm.2025.124.8023

Keywords:

amalgamation, enrichment factor, index of geoaccumulation, mercury, particle size distribution, potential ecological risk index

Abstract

The municipalities of Jose Panganiban and Paracale, Camarines Norte, are notable “mining districts,” where small-scale miners use mercury (Hg) to extract gold, despite its being banned under Republic Act 7076 of the People’s Small Scale Mining Act of 1991. In this study, 17 sediment samples from coastal/marine, river, and mine tailings were collected and analyzed for the following: (1) pollution assessment of potentially toxic elements (PTE), (2) total Hg concentration on particle size distribution, and (3) mercury speciation. The results showed that mercury (Hg) and arsenic (As) were the most significant pollutants and contaminants. Enrichment levels using Enrichment Factor (EF) ranked as Hg > Cr > Zn > Ni > As > Fe > Cu > V > Mn > Sr > Ca. Geoaccumulation Index (Igeo) and Potential Ecological Risk Factor (Er) confirmed that As and Hg posed the highest environmental threats, with Hg likely coming from mining and As naturally occurring but disturbed by mining activities. The mercury concentration patterns varied by location, where river sediments concentrated Hg in medium silt, coastal sediments had scattered Hg levels due to more extended transport, and mine tailings had irregular Hg distribution since they were the source. Moreover, the mercury speciation showed a consistent result of Hg (I) among all the samples and a remarkable peak for Hg0 with the tailings samples, suggesting incomplete oxidation from mining.

References

Bautista, C.P., Punzalan, J., Samaniego, J., Gibaga, C.R., Tanciongco, A., Quierrez, R.N., Gervasio, J.H. and Reyes, R.C. 2024. Pollution assessment of potentially toxic elements in marine sediment from Puerto Princesa Bay, Palawan, the Philippines. Philippine Journal of Science 153(2):501-515.

Buat-Menard, P. and Chesselet, R. 1979. Variable influence of the atmospheric flux on the trace metal chemistry of oceanic suspended matter. Earth and Planetary Science Letters 42(3):399-411. https://doi.org/10.1016/0012-821x(79)90049-9

CCME (Canadian Council of Ministers of the Environment). 1999. Mercury (inorganic) - Canadian soil quality guidelines for the protection of environmental and human health. Retrieved from https://ccme.ca/en/res/mercury-inorganic-canadian-soil-quality-guidelines-for-the-protection-of-environmental-and-human-health-en.pdf

Catedral, S. and Ariyaratne, A. 2020. Artisanal and small-scale gold mining boosts rural programs and infrastructure development in the Philippines. planetGOLD. Retrieved October 9, 2024, from https://www.planetgold.org/artisanal-and-small-scale-gold-mining-boosts-rural-programs-and-infrastructure-development

Chai, Y. and Guo, F. 2023. Potentially toxic element contamination in soils affected by the Antimony mine spill in northwest China. Toxics 11(4):359. https://doi.org/10.3390/toxics11040359

Comsti, M.E.C., de Jesus, C.V. and Marcelo, M.T.R. 1985. Temperatures of gold-quartz vein formation at Olecram Mining Corporation, Jose Panganiban, Camarines Norte as indicated by fluid inclusions. Philippine Geologist 39:35-47.

Ding, H., Ji, H., Tang, L., Zhang, A., Guo, X., Li, C., Gao, Y. and Briki, M. 2015. Heavy metals in the gold mine soil of the upstream area of a metropolitan drinking water source. Environmental Science and Pollution Research 23(3):2831-2847. https://doi.org/10.1007/s11356-015-5479-2

Folk, R.L. and Ward, W.C. 1957. Brazos River bar [Texas]: A study on the significance of grain size parameters. Journal of Sedimentary Petrology 27(1):3-26. https://doi.org/10.1306/74D70646-2B21-11D7-8648000102C1865D

Hakanson, L. 1980. An ecological risk index for aquatic pollution control.a sedimentological approach. Water Research 14(8):975-1001. https://doi.org/10.1016/0043-1354(80)90143-8

Hentschel, T., Hruschka, F. and Priester, M. 2003. Artisanal and Small-Scale Mining. Challenges and Opportunities. International Institute for Environment and Development and WBCSD, Projekt-Consult GmbH, ISBN:1843694700, Printed by Russell Press Ltd, Nottingham, UK.

Hojdova, M., Rohovec, J., Chrastny, V., Penizek, V. and Navratil, T. 2015. The influence of sample drying procedures on mercury concentrations analyzed in soils. Bulletin of Environmental Contamination and Toxicology 94(5):570-576. https://doi.org/10.1007/s00128-015-1521-9

International Labour Organization. 2020. Artisanal and small-scale gold mining baseline report: Camarines Norte and South Cotabato. Retrieved October 10, 2024, from https://www.ilo.org/sites/default/files/wcmsp5/groups/public/@asia/@ro-bangkok/@ilo-manila/documents/publication/wcms_754840.pdf

UNEP-Global Mercury Assessment. 2018. UNEP - UN Environment Programme. https://www.unep.org/resources/publication/global-mercury-assessment-2018

Leng, Q., Ren, D., Wang, Z., Zhang, S., Zhang, X. and Chen, W. 2023. Assessment of potentially toxic elements pollution and human health risks in polluted farmland soils around distinct mining areas in China—A case study of Chengchao and Tonglushan. Toxics 11(7):574. https://doi.org/10.3390/toxics11070574

Lorenzi, S. (n.d.). DMA-80 Direct Mercury Analysis System -Milestone- Helping Chemists. https://www.milestonesrl.com/products/mercury-determination/dma-80-evo.

Mitchell, A. and Balce, G. 1990. Geological features of some epithermal gold systems. Philippines. Journal of Geochemical Exploration 35(1-3):241-296. https://doi.org/10.1016/0375-6742(90)90041-8

NIMD (National Institute for Minamata Disease). 2013. Mercury and health. Minamata Disease Archives V 4.1. Minamata, Kumamoto, Japan. 8p.

Rudnick, R.L. and Gao, S. 2014. Composition of the Continental Crust. In: Holland, H.D. and Turekian, K.K. (eds.), Treatise on Geochemistry, Elsevier, Oxford, 1-51. https://doi.org/10.1016/B978-0-08-095975-7.00301-6

Samaniego, J., Gibaga, C.R., Tanciongco, A. and Rastrullo, R. 2020. Total mercury in soils and sediments in the vicinity of abandoned mercury mine area in Puerto Princesa City, Philippines. Applied Sciences 10(13):4599. https://doi.org/10.3390/app10134599

Samaniego, J. and Tanchuling, M.A. 2018. Physico-chemical characteristics of wastewater from a ball mill facility in small-scale gold mining area of Paracale, Camarines Norte, Philippines. Philippine Journal of Science 147(3):343-356.

Sillitoe, R.H. and Hedenquist, J.W. 2003. Linkages between volcanotectonic settings, ore-fluid compositions, and epithermal precious-metal deposits. Society of Economic Geologists Special Publication 10:315-343. https://doi.org/10.5382/SP.10.17

UNEP Global Mercury Partnership. (n.d.). Artisanal and Small-Scale Gold Mining (ASGM) | Global Mercury Partnership. UN Environment Programme Global Mercury Partnership. Retrieved October 9, 2024, from https://www.unep.org/globalmercurypartnership/what-we-do/artisanal-and-small-scale-gold-mining-asgm.

U.S. Environmental Protection Agency. 2024. Basic Information about Mercury. https://www.epa.gov/mercury/basic-information-about-mercury.

Vieira, H., Bordalo, M., Figueroa, A., Soares, A., Morgado, F., Abreu, S. and Osten, J.R. 2021. Mercury distribution and enrichment in coastal sediments from different geographical areas in the North Atlantic Ocean. Marine Pollution Bulletin 165:112153. https://doi.org/10.1016/j.marpolbul.2021.112153

Wentworth, C.K. 1922. A scale of grade and class terms for clastic sediments. The Journal of Geology 30(5):377-392. https://doi.org/10.1086/622910

Windmoller, C.C., Silva, N.C., Andrade, P.H.M., Mendes, L.A. and do Valle, C.M. 2017. Use of a direct mercury analyzer® for mercury speciation in different matrices without sample preparation. Analytical Methods 9:2159-2167. https://doi.org/10.1039/C6AY03041F

Yumul, G.P., Queano, K.L., Padrones, J.T., Dimalanta, C.B. and Andal, E.A. 2020. Adakitic Paracale Granodiorite in southeastern Luzon, Philippines: A peek at a Proto-Philippine Sea Plate-related magmatic arc. Journal of Asian Earth Sciences X 4:100035. https://doi.org/10.1016/j.jaesx.2020

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Submitted

27-03-2025

Accepted

11-05-2025

Published

01-07-2025

How to Cite

Dela Cruz, K. M. T., Madayag, J. A. T., Arpa, M. C. B., Samaniego, J. O., Peregrino, F. R. A., Quierrez, R. N. M., & Tanciongco, A. M. (2025). Pollution assessment and mercury speciation of small-scale gold mine (SSGM) tailings, sediments, and ore from Camarines Norte, Philippines . Journal of Degraded and Mining Lands Management, 12(4), 8023–8034. https://doi.org/10.15243/jdmlm.2025.124.8023

Issue

Vol. 12 No. 4 (2025)

Section

Research Article

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