ويقدم المتعاقد إلى السلطة قبل مهلة كافية خطة للتعدين الاختباري.
Rates of bioturbation, i.e., the mixing of sediments by organisms, must be measured to analyse the importance of biological activity prior to a mining disturbance and can be evaluated from profiles of excess Pb-210 activity from cores, taking into account the variability in the sediment.