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SDLRC: Brooke Clements highlights technical diamond articles for May 2021

Sheahan Diamond Literature Reference Compilation
The Sheahan Diamond Literature Reference Compilation is compiled by Patricia Sheahan who publishes on a monthly basis a list of new scientific articles related to diamonds as well as media coverage and corporate announcements called the Sheahan Diamond Literature Service that is distributed as a free pdf to a list of followers. Pat has kindly agreed to allow her work to be made available as an online digital resource at Kaiser Research Online so that a broader community interested in diamonds and related geology can benefit. The SDLRC Blog is a guest commentary by an industry expert about articles, themes and trends in recent issues of the SDLRC.

May 2021

Comments by Brooke Clements

Brooke Clements is President and CEO of Craton Minerals Ltd., a Vancouver-based private diamond exploration company focused on discovering North America's next diamond district. He is also President of JBC Ventures Ltd., a consulting company specializing in mineral exploration and community and government relations. From 2007 to 2015 he was President of Peregrine Diamonds Ltd. where he led the team that discovered the Chidliak diamond district on Baffin Island in the Canadian Arctic. Before that, Brooke was Vice President, Exploration for Ashton Mining of Canada Inc. Under his leadership, Ashton and their partner SOQUEM discovered the Renard diamond district in Quebec where the Renard Diamond Mine commenced production in 2016. From 1982 to 1997, Brooke was an Exploration Geologist and Regional Manager for Exmin Corporation where he conducted diamond exploration programs throughout the United States. He holds a BSc in Geology from Indiana University and an MSc in Economic Geology from the University of Arizona.

Brooke Clements has volunteered to highlight the scientific articles that caught his attention in the monthly reference compilations. The opinions expressed are solely his and he can be reached at .

Technical Articles
Brauna 3 mine - South America's first diamond mine developed on a kimberlite deposit. Johnson and Donatti-Filho, ID A link to the presentation given to the Vancouver Kimberlite Cluster on Brazil's first primary diamond mine, Brauna. There is a great summary of diamond exploration and diamonds in Brazil and a detailed description of the Brauna 3 kimberlite and exploration near the mine.
Geology and mining: mineral resources and reserves: their estimation, use, and abuse. *** not specific to diamonds Jowitt and McNulty, ID A good high-level summary of what is required to define resources and reserves.
Plume-driven recratonization of deep continental lithospheric mantle. Liu et al., ID The authors use seismic data and data from kimberlite xenoliths to document the role plume upwelling associated with the Mackenzie plume event 1.3 by ago played in destroying and recratonization of the 200 km thick lithospheric mantle in the north Slave craton region of Nunavut.
Primary asset development standard model - deposit to reserve desktop to feasibility governance - example Gahcho Kue mine, Northwest Territories, Canada. Podolsky, ID A link to a presentation given by Marty Podolsky to the Vancouver Kimberlite cluster on the development of the Gahcho Kue diamond mine in the Northwest Territories. He summarized in detail the tremendous amount of work done to allow declaration of the resources and reserves that underpin the mine. There was lots of core drilling, geologic modelling and RC bulk sampling along with geotechnical drilling and environmental and hydrology studies. The CIM and 43-101 guidelines that need to be followed in the process were also summarized. Brief summaries of the Karowe Mine in Botswana and the Sable kimberlite at the Ekati mine were also provided.
Heavy iron in large gem diamonds traces deep subduction of serpentinized ocean floor. Smith et al., ID The authors studied Fe-Ni-rich inclusions in sublithospheric diamonds interpreted to be from 360-750 km depth. The isotopically heavy iron and unradiogenic osmium signatures suggest that the iron was not formed in the mantle but made its way into the mantle by the subduction of oceanic peridotite.


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