Capacity	Head grade	Tail grade		Treated		Produced
Date	Operator	Locality	Type	Tons/hr	oz./Ton	oz./Ton	Ore source	Tons	Au oz.	Au oz.
late 19th century	"Belgians"	La Union	stamps	?	?	?	Santa Rita	?	?	?
1909-1921	Pophan	La Union	10-60 stamps, cyanide	30-100	0.6-2.0	up to 0.5	La Union, Lamas and outlying	100,000	100,000	70,000
1923-1940	HMJ	La Union	5-10 stamps	15	0.9	0.2	La Union	30,000	28,000	20,000
1932-1943	Rudin	Bonanza	ball mill, floation. Hg in separate mill	50	2.0 +/-	0.2 +/-	Bonanza, surf to 300L	165,000	330,000	300,000
1945-1949	Miramar	Bonanza	ball mill, flotation	10	0.8-1.0 +/-	0.3	Reina, Los Angeles shallow works	15,000	13,000	9,000
1947-1949	Harbroka	La Union	ball mill	50	?	?	La Union	?	?	?
1949-1953?	?	Miramar	flotation, jigs	20	0.7-1.0	0.5+/-	Los Angeles shallow, Reina	24,000	19,000	7,000
1954-1959	Montes de Oro	Bonanza	ball mill, barrel amalgamation. Hg in separate mortar mill	15 (to -65 mesh)	1.9	0.3	Bonanza, Lamas	467	900	750
				Historic Production			Total:	334,467	490,900	406,750