Global Carbon Dioxide Removal Potential of Waste Materials From Metal and Diamond Mining
نویسندگان
چکیده
There is growing urgency for CO 2 removal strategies to slow the increase of, and potentially lower, atmospheric concentrations. Enhanced weathering, whereby natural reactions between silicate minerals that produce dissolved bicarbonate ions are accelerated, has potential remove substantial on decadal centennial timescales. The global mining industry produces huge volumes of fine wastes could be utilised as feedstock enhanced weathering. We have compiled a database weathering mined metal diamond commodity tailings from silicate-hosted deposits. Our data indicate all deposit types, notably mafic ultramafic rock-hosted operations high tonnage Cu-hosting deposits, capture ~1.1–4.5 Gt annually, 31 125% industry's primary emissions. However, current knowledge suggests dissolution rates many relatively slow, such only fraction (~3–21%) this may realised timescales <50 years. Field trials in mine settings urgently needed and, if prediction confirmed, then methodologies accelerating will need developed.
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ژورنال
عنوان ژورنال: Frontiers in climate
سال: 2021
ISSN: ['2624-9553']
DOI: https://doi.org/10.3389/fclim.2021.694175