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Militky and co-workers described the preparation of CNFs from jute fibres in aqueous conditions.53 Jute was firstly chemically treated to remove the lignin and hemicellulose. The resulting material was then initially pulverized using a planetary mill in a dry environment (10 minutes) and subsequently in wet conditions (3 hours) at 850 rpm. Interestingly, the absence of a dispersion medium had an impact on the size of the resulting CNFs. In particular, ball milling in dry conditions led to a wider size distribution since the material was sticking to the surface of the container and formed aggregates due to the presence of surface interactions in the dry state. Particle size in this case was around 500 nm.
These mills contain literally hundreds of thousands of three inch diameter steel balls that pulverize the ore until it is like fine sand or face powder. Only then are the copper minerals broken free of the rest of the rock to be separated by flotation.
Gold Resource Corp: The company announced the intent to create two independent, strategically focused companies with the Nevada Mining Unit (NMU) to be spun-out to shareholders (Spinco). This makes a lot of sense as the Oaxaca Mining Unit (OMU) will focus solely on its prospective portfolio of assets in Mexico, while the Spinco will be able to focus on its Nevada Gold assets. This should unlock shareholder value as the Spinco should receive a premium as it will be focused entirely in Nevada, one of the best mining jurisdictions in the world. Further, in 2021, the NMU will see material production growth at lower costs as it accesses the higher-grade Pearl deposit, compared to Isabella, which has been the focus in 2020. The OMU will continue to trade under the ticker GORO, and it will be able to re-invest all cash flow back into the ground and likely increase production over the coming years.
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