global: more mining related datasets

crates/brk_structs/src/structs/dollars.rs

@@ -1,6 +1,7 @@
 use std::{
     cmp::Ordering,
     f64,
+    iter::Sum,
     ops::{Add, AddAssign, Div, Mul},
 };
 
@@ -378,3 +379,10 @@ impl Ord for Dollars {
         }
     }
 }
+
+impl Sum for Dollars {
+    fn sum<I: Iterator<Item = Self>>(iter: I) -> Self {
+        let dollars: f64 = iter.map(|dollars| dollars.0).sum();
+        Self::from(dollars)
+    }
+}