OHMI Pima County

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Mots-clés	PHYTOMINING

Porteur	Session	Titre	Mots-clés	Résumé
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Raina Maier	2022	Identifying drought adapted, native metal hyperaccumulating plants, and optimizing their phytoextraction potential in the Santa Cruz River Valley region.	PHYTOEXTRACTION PHYTOMINING PHYTOREMEDIATION HYPERACCUMULATION XRF ANALYSIS ECOCATALYSTS HEAVY METALS GREEN CHEMISTRY	Southeastern Arizona, including the upper valley of the Santa Cruz River, has one of the most diverse mining localities in the state. Mine wastes at many legacy mine sites in this region are sources and sinks of toxic heavy metals and they directly cause the ecological, economic, and social damage. A new, transformative strategy via interdisciplinary collaborative efforts is urgently needed to drive a wedge between an unsafe and altered environment and the natural ecosystem including its native inhabitants. We propose a series of field surveys and greenhouse experiments, to perform screening of elemental concentration of plants growing naturally on legacy mine sites across the Southeastern Arizona. By identifying native plants that accumulate high concentrations of metals into their leaves, we will not only be able to accelerate the development of “green” remediation techniques at the impacted lands across Santa Cruz River valley, but also greatly contribute to our ongoing efforts towards developing a new generation of “eco”-catalysts – so far not addressed in the Santa Cruz Valley region – by returning the extracted heavy metals to supply chain. Further, we see this research as the initial step to create the socio-ecological infrastructure in the upper valley of the Santa Cruz River region. We anticipate that in longer time perspective our findings and contribution to development of novel technologies will stimulate local communities on an economic level, by creating new job opportunities in plant-based technological operations towards overall landscape enhancement.		Afficher
Luís Novo	2020	Distribution and accumulation of metals in soil and vegetation surrounding a molybdenum roasting facility at the Sierrita mine, Pima County	Phytomining; Metal pollution; Rhenium; Phytoremediation; Mine tailings; Pima County	Mining provides essential raw materials for an industrialized society. However, it often comes at a great cost. Mining activities, including mineral processing-related emissions and the disposal of tailings, can be severely hazardous to human health and the environment. In Pima County, copper mining began in the 1870s. Today, the combined output of its three major mines represents nearly a quarter of the US total copper production. The Sierrita mine is an open-pit copper and molybdenum mining complex, whose first claims were recorded in 1895. Today, the Sierrita operation comprises a 100,000-metric ton-per-day concentrator that produces copper and molybdenum concentrate. Molybdenite (MoS2), is one of the by-products in this concentrate, and the main host of rhenium (Re). Following oxidation roasting of the concentrate, Re is released as rhenium heptoxide (Re2O7) with the flue gases, and then dispersed on the soil in its most stable and bioavailable form - the perrhenate ion (ReO4-). Rhenium is one of the scarcest (7 × 10^−8 %) and most broadly dispersed elements on Earth’s upper crust. Because of its rarity and distinguishing physicochemical properties, rhenium is also one of the costliest metals. Recent reports suggest that certain plants may have the ability to accumulate economically profitable amounts of Re, opening a window of opportunity for phytomining – a plant-based technique to retrieve valuable elements from natural and waste substrates. The main objectives of this project are to investigate the occurrence of metal contamination due to molybdenum roasting emissions, and assess the viability of field-scale Re phytomining.		Afficher

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