To complete the “Lucky Strike” side quest in Fallout 76, follow these detailed steps:

### Step 1: Acquire the Map
1. Locate U-MINE-IT Vending Machines: There are six U-MINE-IT vending machines located around the Ash Heap area. These machines sell maps that trigger the “Lucky Strike” side quest.
2. Buy a Map: Purchase one of the three available maps from the vending machines. Each map costs a different amount of caps, ranging from cheap to expensive.

### Step 2: Identify the Location
1. Highlight on Map: Once you buy a map, it will highlight a small area on your map where you need to go to complete the quest.
2. Navigate to the Location: Travel to the highlighted area. The location might be a mound or a specific landmark indicated by the map.

### Step 3: Excavate the Site
1. Approach the Site: When you arrive at the location, approach the mound or site indicated by the map.
2. Excavate: Use your shovel or pickaxe to excavate the site. This action will trigger the completion of the “Lucky Strike” side quest.

### Step 4: Rewards and Additional Information
1. Rewards: Completing the quest will reward you with various items such as black titanium, concrete, lead, aluminum, and sometimes gold. You may also receive healing items like Radaway or Stimpacks.
2. Multiple Quests: You can activate multiple maps at once, which will show multiple “Lucky Strike” quests in your side quest list. Each map will give you 20 caps and random ammo.

By following these steps, you should be able to complete the “Lucky Strike” side quest in Fallout 76.