LONDON--Karelian Diamond Resources PLC (KDR.LN), the diamond exploration company focused on the Karelian Craton in Finland, said Thursday that it has signed an amendment letter to extend the existing Confidentiality Agreement, with Rio Tinto Mining and Exploration Ltd until June 30, 2020.

Under the Confidentiality Agreement, Rio Tinto may disclose to Karelian confidential information and physical geological samples relating to exploration in Finland for the purpose of Karelian considering that information in relation to Karelian's potential and existing exploration programs in Finland.

In consideration of Rio Tinto disclosing the confidential information to it, Karelian has agreed that Rio Tinto will have the option (exercisable at its discretion) to earn a 51% interest in any project identified by Karelian in Finland by Rio Tinto paying the direct cash expenditures incurred in developing the project subject to conditions.

Karelian Diamond shares at 0803 GMT traded flat at 2 pence, valuing the company at GBP5 million.

-Write to Razak Musah Baba at razak.baba@wsj.com; Twitter: @Raztweet

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