Nah, the point was regarding these figures (didn't watch video)
https://www.reuters.com/article/uganda-gold-idUSKBN2NP17M
Typical high quality deposits contain 10 g/t gold = 10 / 1 000 000 = 0.001%
I.e. the person I discussed with considered the implied purity in the article entirely unrealistic, and is 1000 times above the figure Google claims to be a typical high purity (that's the 0.001% above).
0.001% of 31 million tonnes = 310 tonnes gold
$54.74 million/tonne * 310 tonnes = roughly $17 billion
Do note that 31 million seems different from 320 million in video. If it's indeed 320 million tonnes of ore then the value can be north of $170 billion.