Collectively if planets are concentrated in the artha trikona trine of houses 2, 6, and 10, it can represent wealth in the chart. Artha is often translated as "wealth" but a better word, in my opinion, is sustenance. These house sustain us in the physical world and help us acquire the resources we need. They correlate with the earth signs, Taurus, Virgo, Capricorn. Both the earth signs and the earth houses (2, 6, and 10) represent the productivity of our actions in the physical world. The 2nd house helps us earn money, the 6th house is one's service to others and one's job, and the 10th house is one's profession and actions in the world. They share similar traits and are different octaves of one another with the 10th house being the fullest expression.
Of the artha houses only the 2nd house is truly a wealth producing house. The 2nd house from any house is a house of gains for that house, just like the 12th from any house is the house of loss for that house. For instance, the 11th house is the house of gains for one's career (10th house), the 8th house is the house of gains of one's spouse (7th house) etc.
The primary dhana yoga or wealth producing houses are houses 1, 2, 5, 9, and 11. Any combination of these will produce wealth and the quantity and strength of these yogas can indicate extreme wealth.
The 1st house is important because it is the foundation of one's life and one's health. It shows what comes to us, since it's the house of one's self and identity. K.N. Rao writes in Learn Hindu Astrology Easily:
The lords of certain houses combine to promise gain of wealth in a horoscope. The cardinal and most important always is the lagna and lagna lord. To achieve anything in life sound health is necessary. Bad health can be a reason for poverty, lack of concentration in the work undertaken, and other misfortunes.
- Ch. 12
The 2nd house is well known as the house of earning as we mentioned above.
The 5th and 9th houses are lakshmi sthanas or houses of Lakshmi the Goddess of wealth.
The 11th house is the house of gains of one's career as mentioned.
In addition, Jupiter's position must also be seen since it's the karaka or significator of houses 2, 5, 9, and 11.
I recently asked K.N. Rao about whether the 6th lord combining with a dhana yoga house lord (1, 2, 5, 9, 11) can bring wealth through 6th house matters like one's job, service, healing, conflicts, competition etc. His answer was simply 'yes'. The 6th house is tricky to interpret for wealth because it's not only an artha trikona house but a dusthana house along with the 8th and 12th houses, so it can also deny wealth and show obstacles and conflicts. To determine whether it gives or denies wealth we have to look closely at the individual case and see the strength of the planets involved.
The 10th house, in and of itself, doesn't represent wealth. However, if the 10th lord is strong it certainly will lead to wealth through career especially if it combines with houses 1, 2, 5, 9, 11 or there are other dhana yogas in the chart.