A refractory gold ore has mostly a pyritic gold mineralogy with an overall grade of 2.23 g Au per tonne. The recovery process involves two stages. The first stage involves the concentration of gold-bearing fraction into 4.42% of the ore crushed. Tailings from this first stage shows the following in its size fractions:

Tailings Particle Size (mesh)	Mass (% wt.)	Gold (g/tonnne)
+200	15.35	0.062
-200 +400	34.45	0.039
-400	50.20	0.072

Subsequently, the concentrate is treated with a pressure oxidation process which allows a stage recovery of 95.53% gold recovery.

a) What is the Au assay of the overall tailings and the gold recovery in the first stage?

b) What is the overall gold recovery based on the first and second stages combined?