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Patrick Stewart

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  1. Added: September 29, 2023In: Mining Software Solutions

    What is intelligent ventilation?

    Patrick Stewart
    Patrick Stewart Mining Engineer
    Added an Comment on September 30, 2023 at 12:24 am

    Thanks for sharing.

    Thanks for sharing.

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  2. Added: July 19, 2023In: Mining Sustainability

    Seabed Mining

    Patrick Stewart
    Patrick Stewart Mining Engineer
    Added an Comment on August 1, 2023 at 10:13 pm

    Hi, I have done some research about deep sea mining and its regulations. Here is the link to the results that can be beneficial to you. Details are also below. A healthy deep ocean is essential for the well-being of both humans and the environment. It serves as a carbon sink, storing large amount ofRead more

    Hi,

    I have done some research about deep sea mining and its regulations. Here is the link to the results that can be beneficial to you. Details are also below.

    A healthy deep ocean is essential for the well-being of both humans and the environment. It serves as a carbon sink, storing large amount of human-generated carbon dioxide, and is home to a vast array of unique and diverse species, many of which have yet to be identified. Currently, it is one of the few places on Earth largely free from human pressure, but that could soon change with the commencement of a new extractive industry known as deep-seabed mining (DSM).

    In international waters, the International Seabed Authority (ISA) governs DSM, as required by the United Nations Convention on the Law of the Sea (UNCLOS), regulating any mining activities and overseeing the effective protection of the marine environment from harmful effects. The ISA is also tasked with ensuring that DSM in the deep sea is undertaken in accordance with the common heritage of humankind principle, including equitable sharing of financial benefits.

    Thus far, the ISA has created and adopted regulations to govern exploration, awarded 31 exploration contracts and is in the process of negotiating exploitation regulations that would govern any future commercial mining activities.

    However, in 2021, the Republic of Nauru notified the ISA of its intent to sponsor a DSM application by a private mining company, triggering a time-limited provision in UNCLOS that requires the ISA to either complete development of the regulations to enable DSM in two years or consider mining proposals without internationally agreed-upon regulations in place. As a result, the prospects of DSM commencing soon—in the absence of sufficiently precautionary regulations—has become a distinct reality.

    Since the triggering of this provision, more than 20 member States of the ISA have publicly called for a moratorium, precautionary pause or complete ban on DSM in the international seabed, with a growing number of countries indicating that they will not approve of any mining without a completed and adopted regulatory framework. Proponents of DSM, on the other hand, have questioned the very legality of such a pause or moratorium and whether it is consistent with UNCLOS.

     

    Link to the content and author:

    https://www.pewtrusts.org/en/research-and-analysis/fact-sheets/2023/06/seabed-mining-moratorium-is-legally-required-by-un-treaty-legal-experts-find#:~:text=In%20international%20waters%2C%20the%20International,marine%20environment%20from%20harmful%20effects.

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  3. Added: July 22, 2023In: Mining Operations

    Blast Exclusion Determination (Machines and Personnel

    Patrick Stewart
    Patrick Stewart Mining Engineer
    Added an Comment on August 1, 2023 at 9:28 pm

    Hi, From my knowledge the important factor to consider is what we call the PPV. According to the paper below (as per the link). As a critical parameter to measure the blasting intensity, the peak particle velocity (PPV) of vibration induced by blasting, should be accurately predicted, and can providRead more

    Hi,

    From my knowledge the important factor to consider is what we call the PPV. According to the paper below (as per the link). As a critical parameter to measure the blasting intensity, the peak particle velocity (PPV) of vibration induced by blasting, should be accurately predicted, and can provide a useful guideline for the design of blasting parameters and the evaluation of the damage. And there are ranges that are set by regulations that should not be exceeded to prevent any damage to the people and environment.

    The other factor to consider is fly rocks. As this can cause damage to equipment and even to people, hence it is important to ensure that there are no equipment or people near the blast. And lastly, experience also comes into play after conducting several blasts and exposure to the blast. Blasting near a town may require a different design parameter compared to blasting further away from a town.

    Link to the article about PPV.

    https://www.sciencedirect.com/science/article/pii/S2467967422000484#:~:text=As%20a%20critical%20parameter%20to,the%20evaluation%20of%20the%20damage.

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  4. Added: May 11, 2023In: General Information

    Underground reef drives development

    Patrick Stewart
    Best Comment
    Patrick Stewart Mining Engineer
    Added an Comment on May 12, 2023 at 9:16 pm

    Nana, Reef drive is a drive or small tunnel going trough the reef or the ore. Ore drive is also a tunnel going trough the ore. Reef drive is usually talked about in narrow vein mining and ore drive is basically for bigger ore body like for long hole stoping. Thanks,

    Nana,

    1. Reef drive is a drive or small tunnel going trough the reef or the ore.
    2. Ore drive is also a tunnel going trough the ore.

    Reef drive is usually talked about in narrow vein mining and ore drive is basically for bigger ore body like for long hole stoping.

    Thanks,

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  5. Added: March 6, 2023In: Geology

    Narrow vein underground grade control

    Patrick Stewart
    Patrick Stewart Mining Engineer
    Added an Comment on March 28, 2023 at 11:49 am

    Drilling the ore body to determine the thickness  is key ,than after receiving assay, you need to calculate de gold grade, than you can back calculate the average grade. Strong block model is the excellent tool to determine the grade. You also need need to understand the structure around the vein. ORead more

    Drilling the ore body to determine the thickness  is key ,than after receiving assay, you need to calculate de gold grade, than you can back calculate the average grade.
    Strong block model is the excellent tool to determine the grade. You also need need to understand the structure around the vein. Once you started developing trough the ore, you need to crosscheck it on daily basis and conduct regular sampling of active faces and make sure you are getting assay results quickly to adjust the development. Hence advanced drilling is key to position you ore development.
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