Plutonium-based.
Its plutonium was produced at Hanford site.
Video 1.
Trinity Test Preparations by AtomicHeritage (2016)
. Source. Appears to be a compilation of several videos, presumably each with their own separate LA-UR, though these are not noted. Credited: "Video courtesy of the Los Alamos National Laboratory Archives", TODO how to search that archive online?
Video 2.
Trinity: Getting The Job Done
. Source. Good video, clarifies several interesting technical points:

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