Have a look at the resource study for Panda Hill Niobium deposit in Tanzania. There is quite a bit of detail about the process that may be useful in your study. For bulk densities in oxide zones they used 2.15t/m3.
https://www.cradleresources.com.au/wp-content/uploads/2015/01/CXX-PANDA-HILL-RESOURCE-UPDATE.pdf
Also, for those more generally interested Cradle Resources undertook a DFS in 2016, presentation available here:
https://www.cradleresources.com.au/wp-content/uploads/2016/04/Cradle-Definitive-Feasibility-Study-Investor-Presentation.pdf
They were extremely positive at the time, note the slide subtitled: "Panda Hill will be the worlds next Niobium mine due to robust economics", however the project hasn't flown for a variety of reasons. There have been ownership and management disputes complicated by the Tanzanian govt imposing a free-carry interest. The deposit seems fairly well studied but the average grade of 0.5% also makes it marginal. Still, some useful info in the attached docs.
Have a look at the resource study for Panda Hill Niobium deposit...
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