Ag & Au Flashcards
One of the reasons of the beginning of systematic work by the end of the 19th century is the introduction of modern methods of mining and ore dressing in Gold exploration. In line with this, what paved the way for large scale mining operations on Paracale, Camarines Norte to tap its rich alluvial placer grounds gold deposit?
The use of dredges
During the 19th century, advances in exploration were made due to the arrival of Americans that largely influenced the exploration work in gold industry. What are the two new technologies for underground mining and ore dressing that were introduced back then, that were applicable for numerous gold-quartz vein deposits in the different parts of the archipelago?
Flotation and Cyanidation
Due to modern technology advancement and the discovery of several major gold veins in Baguio district , this mining corporation was put to rise and organize in 1903 where the mine’s production started in 1906 and first gold boom was on 1930.
Baguio Corporation (Benguet Consolidated Mining Corporation)
When did the major gold veins in Baguio district discovered?
1911
Why did the porphyry-Cu mines started to gain importance during the 50’s?
these mines especially those that were operating Porphyry Cu-Au were producing Au as a by-product of Cu were > 50% attributed to the production of Au-Ag from 1972-1982.
In 1985, a marked improvement in Gold and Silver production were attained due to the small scale mining activities that were prominent especially when it was supplemented by the discovery of this deposit that eventually became the site of the biggest gold rush in the Philippine history.
Diwalwal deposit
True or False: Recent declaration of Diwalwal as a mineral reservation would push gold production for future use.
True
Worldwide, the Philippines has been an important Gold producer ranking what place in 2002?
29th
When did the country placed second to South Africa in terms of gold production per unit area?
1988
In terms of reserves, based on past production and defined resources the Philippine mineral endowment for gold, ranks?
2nd
Mitchell and Leach (1911) noted the apparent relationship of Gold Mineralization to the Philippine Fault, however any relationship was found to be indirect, why?
most ore bodies and major prospects are not situated at the main fault trace, but rather along or within tensional splays oblique to the Philippine Fault Zone
What are the two major arcs where magmatism in these areas have been active since at least the Tertiary to the present, that are considered as the most prolific gold producers in the country?
Western Luzon Arc and Eastern Philippine Arc
What type of deposits that largely coincide with the axes of these magmatic arcs in Luzon?
Epithermal Gold deposits
In general gold mineralization in Luzon are characterized by?
Epithermal Gold, Miocence volcanic activity and andesitic volcanism of Pliocene to quaternary age
The Baguio Mankayan gold district together with the Cu-Au prospects in the Abra-Kalinga-Apayao province area farther north defines the gold occurencences in the?
Western Luzon Arc
