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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.
December 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 .
Pat found this 2014 paper from the journal "Solid Earth" that she had not previously listed. It is an interesting study of picroilmenite from the Yakutia region of Russia.
Rio Tinto discovered the Bunder lamproite field in the Madya Pradesh region of India in 2004. After determining the economics of the project were favorable, they began the permitting process and prepared to develop the project. In 2017 Rio Tinto exited. The project was acquired by an Indian mining company, Birla in 2019. The company is facing environmental opposition because the project lies in a forest near a tiger reserve, and it is estimated that over 200,000 trees would need to be cut to develop the mine. This paper in Third World Quarterly, studies the Rio Tinto exit from the project in 2017 focusing on the political process and local opposition.
The Lomonosov kimberlite within the Archangelsk province in extreme northwestern Russia was studied using radiometric and seismic methods. The pipe shows up well from the radiometric survey. The authors concluded that the study "revealed an ore-controlled fault system and probably a supply channel (i.e. dyke)", a result supported by drill data.
This +1 hour Youtube video of a presentation given by Dr. Grutter to the Vancouver kimberlite cluster in November and discussion after the presentation is a great summary of the use of microdiamonds to evaluate the economic potential of kimberlites with real world examples.
A summary of diamonds from many host rocks including kimberlite, lamproite, impactites, metamorpic rocks and ophiolites. Includes three good maps showing worldwide diamond occurrences. This paper published by Geochemistry International is not yet available online.
Most diamonds originate from 150-200 km depth in the upper mantle at the base of the continental lithosphere while sublithospheric or "super-deep" diamonds are thought to originate in the lower mantle at 300-800 km depth. This paper summarizes the state of current research regarding diamonds thought to form below the lithosphere.
