Exports of tin and silver were the mainstays of the _______ economy for many decades. However, today, as the market for tin has declined, the country has become an exporter of other metallic ores, such as gold.

This might be the country you need.

http://www1.american.edu/TED/bolgold.htm

Exports of tin and silver were the mainstays of the _______ economy for many decades. However, today, as the market for tin has declined, the country has become an exporter of other metallic ores, such as gold

Exports of tin and silver were the mainstays of the _______ economy for many decades. However, today, as the market for tin has declined, the country has become an exporter of other metallic ores, such as gold.

To find the answer to this question, we need to identify which country is being referred to. The sentence states that exports of tin and silver were the mainstays of its economy for many decades, and that it has now become an exporter of other metallic ores like gold.

To solve this, we can look for clues within the sentence. The key information here is that the country used to export tin and silver, but now exports gold instead. We need to find a country where tin and silver export were significant in the past and the current main export has shifted to gold.

Using a search engine or our general knowledge, we can review information about countries that have a history of tin and silver exports. Once we find a country that matches this criterion, we can check if it currently exports gold.

By conducting a search, we can determine that Bolivia is the country being referred to. Bolivia's economy was heavily reliant on tin and silver exports for many years. However, due to the declining tin market, Bolivia has become an exporter of other metallic ores like gold.

Now that we have the answer, we can assert that the missing word is "Bolivian." Hence, the exports of tin and silver were the mainstays of the Bolivian economy for many decades.