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Both aluminum and copper oxidize when exposed to air. The anodized aluminum found in factory built antennas is actually a form of oxidation... Regardless, the performance of the antenna is no going to be affected by surface tarnish on either aluminum or copper antenna elements.
Just be sure that the connections between the element(s), phasing lines and any other metal to metal contact is secure and low resistance. Soldering is probably the most reliable method, but the pressure of a nut & bolt connection can seal the two metal parts tightly enough to prevent corrosion at the actual interface of the two parts.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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