Yes Sir,
Ten years seems about right:

April 1, 1976, Cupertino, CA

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While The largest diamond mine The Yubileyny diamond mine, which is commonly known as Jubilee, is located in Sakha, Russian Federation, and is the biggest diamond mine in the world. The open-pit diamond mine has been in production since 1986 and has diamond reserves of more than 150 million carats.
Looks a bit like Lynas

Williamson diamond mine

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Williamson diamond mine (Mwadui)

Location
Williamson diamond mine Location in Tanzania
Country	Tanzania
Coordinates	03°31′S033°36′ECoordinates: 03°31′S033°36′E
Production
Products	Diamonds (300,000 carats per annum)
History
Opened	1940
Owner
Company	Petra Diamonds (75%) Government of Tanzania (25%)

The Williamson Diamond Mine (also known as the Mwadui mine) is a diamond mine 23 kilometres (14 mi) northeast of Shinyanga in Tanzania; it became well known as the first significant diamond mine outside of South Africa. The mine was established in 1940 by Dr. John Williamson, a Canadiangeologist,^[1] and has been continuous operation since then, making it one of the oldest continuously operating diamond mines in the world. Over its lifetime it has produced over 19 million carats (3,800 kg) of diamonds. The Williamson mine was once owned by its namesake Dr. Williamson and later nationalized by the government of Tanzania. Since February 2009 the mine is mostly owned by Petra Diamonds, with 75% ownership, the government of Tanzania owning the remaining 25%.^[2]