Do we know whether the analysis tools to produce assay results...

Do we know whether the analysis tools to produce assay results have changed significantly over time? E.g. would the technique used decades ago by east Germany to define the % of our seam be a) less accurate and/or b) infantile compared to todays methods?

i agree that the seam horizon and depth aligning with the historical data is exceptional and instils confidence - leading me to believe the % data from the time was thought accurate at the time with the instruments/techniques they used. But what if their techniques aren’t aligned with todays standards?? Don’t get me wrong - I’m very bullish and am probably over exposed to this stock. Would just like to better understand risks associated with this type of drilling.

cheers