It is being said throughout Black Panther that Wakanda has Vibranium in abundance. In the present day, they've got super high-tech weapons and systems.
But when they show the past (T'chaka and his brother) at that time too they had a high-tech jet. So my questions
From where exactly did Wakanda get the Vibranium?
Back in that time, how did they get the resources to create such high-tech items?