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SDLRC: Brooke Clements highlights technical diamond articles for November 2019

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.

November 2019

Comments by Brooke Clements

Brooke Clements received a B.Sc in Geology from Indiana University and an M.Sc in Economic Geology from the University of Arizona. From 1982 to 1997, he was an Exploration Geologist and Regional Manager for Exmin Corporation where he conducted diamond exploration programs throughout the United States. From 1998 to 2007 he was Vice President, Exploration for Ashton Mining of Canada Inc. Under his leadership, the Ashton-SOQUEM exploration team discovered the Renard diamond district in Quebec where Stornoway Diamonds opened the Renard Diamond Mine in 2016. 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. Currently, Brooke is President of JBC Ventures Ltd., a consulting company specializing in mineral exploration and community and government relations. He is also President and CEO of Craton Minerals Ltd., a private diamond exploration company focused on discovering North America's next new diamond district.

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
The southern Sao Francisco craton puzzle: insights from aerogeophysical and geological data. Dantas de Araujo et al., ID Many a diamond explorer has thought about the diamond potential of the São Francisco craton in southern Brazil and some of those have explored there. In one way or another they all ask the same question, where in the world did all those alluvial diamonds come from? A few reasonable theories have been proposed for the source of these diamonds, but it's possible that there remains a mother lode of diamonds to be found by a creative and persistent explorer. The authors use new geophysical data to present a model for the tectonic evolution of the southern São Francisco craton from the Archean through the Proterozoic that will undoubtedly be a reference for future explorers in the region.
Geochemistry and Sr-Nd isotopic compositions of Permian ultramafic lamprophyres in the Reelfoot Rift- Rough Creek graben, southern Illinois and northwestern Kentucky. Maria et al., ID A few decades ago, when there was a fair amount of diamond exploration in the USA, there was some interest in the ultramafic lamprophyres dykes, sills and diatremes of the Reelfoot rift area in Illinois and Kentucky, the "Midwest Permian Ultramafic District". The area, most notably Cave-In-Rock, Illinois, is also known for its spectacular fluorite and sphalerite specimens. The paper is a good summary of the district with tectonic speculation on its formation, based on the detailed study of seven intrusions. There is also an excellent geologic map of the district.
Diamonds and the mantle geodynamics of carbon. Shirey et al., ID A good summary of the state of research and questions that need to be answered regarding lithospheric and superdeep diamonds and carbon in the mantle that is summed up well in the abstract: "The importance of diamond to carbon in Earth is due to the fact that diamond is the only mineral and especially the only carbon mineral to crystallize throughout the silicate Earth -- from the crust to the lower mantle. To study diamond is to study deep carbon directly throughout Earth, allowing us to see the inaccessible part of the deep carbon cycle. By using the properties of diamond, including its ability to preserve included minerals, important questions relating to carbon and its role in planetary-scale geology can be addressed."
Indirect rule redux: the political economy of diamond mining and its relation to the Ebola outbreak in Kono district, Sierra Leone. Frankfurter et al., ID This paper presents a history of the development of Sierra Leone with emphasis on the resource industry, diamond mining and Koidu Holdings. They make a case that the health care system in the country is underfunded due in part to the local system of government and corruption and tax evasion related to mining. They outline that the poor health care infrastructure contributed greatly to the extent of the ebola crisis in the country between 2014 and 2016.
Micro-diamonds: proposed origins, crystal growth laws, and the underlying principle governing resource predictions. Haggerty, ID Dr. Haggerty presents evidence that suggests the genesis of microdiamonds and macrodiamonds are largely unrelated but the size frequency distribution relationship between them is valid to use for predicting diamond grade in a kimberlite or lamproite. The paper has an excellent reference list.


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